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23.3.1 (2023-10-21)
===================
Bug Fixes
---------
- Handle a timezone indicator of Z when parsing dates in the self check. (`#12338 <https://github.com/pypa/pip/issues/12338>`_)
- Fix bug where installing the same package at the same time with multiple pip processes could fail. (`#12361 <https://github.com/pypa/pip/issues/12361>`_)
23.3 (2023-10-15)
=================
Process
-------
- Added reference to `vulnerability reporting guidelines <https://www.python.org/dev/security/>`_ to pip's security policy.
Deprecations and Removals
-------------------------
- Drop a fallback to using SecureTransport on macOS. It was useful when pip detected OpenSSL older than 1.0.1, but the current pip does not support any Python version supporting such old OpenSSL versions. (`#12175 <https://github.com/pypa/pip/issues/12175>`_)
Features
--------
- Improve extras resolution for multiple constraints on same base package. (`#11924 <https://github.com/pypa/pip/issues/11924>`_)
- Improve use of datastructures to make candidate selection 1.6x faster. (`#12204 <https://github.com/pypa/pip/issues/12204>`_)
- Allow ``pip install --dry-run`` to use platform and ABI overriding options. (`#12215 <https://github.com/pypa/pip/issues/12215>`_)
- Add ``is_yanked`` boolean entry to the installation report (``--report``) to indicate whether the requirement was yanked from the index, but was still selected by pip conform to :pep:`592`. (`#12224 <https://github.com/pypa/pip/issues/12224>`_)
Bug Fixes
---------
- Ignore errors in temporary directory cleanup (show a warning instead). (`#11394 <https://github.com/pypa/pip/issues/11394>`_)
- Normalize extras according to :pep:`685` from package metadata in the resolver
for comparison. This ensures extras are correctly compared and merged as long
as the package providing the extra(s) is built with values normalized according
to the standard. Note, however, that this *does not* solve cases where the
package itself contains unnormalized extra values in the metadata. (`#11649 <https://github.com/pypa/pip/issues/11649>`_)
- Prevent downloading sdists twice when :pep:`658` metadata is present. (`#11847 <https://github.com/pypa/pip/issues/11847>`_)
- Include all requested extras in the install report (``--report``). (`#11924 <https://github.com/pypa/pip/issues/11924>`_)
- Removed uses of ``datetime.datetime.utcnow`` from non-vendored code. (`#12005 <https://github.com/pypa/pip/issues/12005>`_)
- Consistently report whether a dependency comes from an extra. (`#12095 <https://github.com/pypa/pip/issues/12095>`_)
- Fix completion script for zsh (`#12166 <https://github.com/pypa/pip/issues/12166>`_)
- Fix improper handling of the new onexc argument of ``shutil.rmtree()`` in Python 3.12. (`#12187 <https://github.com/pypa/pip/issues/12187>`_)
- Filter out yanked links from the available versions error message: "(from versions: 1.0, 2.0, 3.0)" will not contain yanked versions conform PEP 592. The yanked versions (if any) will be mentioned in a separate error message. (`#12225 <https://github.com/pypa/pip/issues/12225>`_)
- Fix crash when the git version number contains something else than digits and dots. (`#12280 <https://github.com/pypa/pip/issues/12280>`_)
- Use ``-r=...`` instead of ``-r ...`` to specify references with Mercurial. (`#12306 <https://github.com/pypa/pip/issues/12306>`_)
- Redact password from URLs in some additional places. (`#12350 <https://github.com/pypa/pip/issues/12350>`_)
- pip uses less memory when caching large packages. As a result, there is a new on-disk cache format stored in a new directory ($PIP_CACHE_DIR/http-v2). (`#2984 <https://github.com/pypa/pip/issues/2984>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2023.7.22
- Add truststore 0.8.0
- Upgrade urllib3 to 1.26.17
Improved Documentation
----------------------
- Document that ``pip search`` support has been removed from PyPI (`#12059 <https://github.com/pypa/pip/issues/12059>`_)
- Clarify --prefer-binary in CLI and docs (`#12122 <https://github.com/pypa/pip/issues/12122>`_)
- Document that using OS-provided Python can cause pip's test suite to report false failures. (`#12334 <https://github.com/pypa/pip/issues/12334>`_)
23.2.1 (2023-07-22)
===================
Bug Fixes
---------
- Disable :pep:`658` metadata fetching with the legacy resolver. (`#12156 <https://github.com/pypa/pip/issues/12156>`_)
23.2 (2023-07-15)
=================
Process
-------
- Deprecate support for eggs for Python 3.11 or later, when the new ``importlib.metadata`` backend is used to load distribution metadata. This only affects the egg *distribution format* (with the ``.egg`` extension); distributions using the ``.egg-info`` *metadata format* (but are not actually eggs) are not affected. For more information about eggs, see `relevant section in the setuptools documentation <https://setuptools.pypa.io/en/stable/deprecated/python_eggs.html>`__.
Deprecations and Removals
-------------------------
- Deprecate legacy version and version specifiers that don't conform to `PEP 440
<https://peps.python.org/pep-0440/>`_ (`#12063 <https://github.com/pypa/pip/issues/12063>`_)
- ``freeze`` no longer excludes the ``setuptools``, ``distribute``, and ``wheel``
from the output when running on Python 3.12 or later, where they are not
included in a virtual environment by default. Use ``--exclude`` if you wish to
exclude any of these packages. (`#4256 <https://github.com/pypa/pip/issues/4256>`_)
Features
--------
- make rejection messages slightly different between 1 and 8, so the user can make the difference. (`#12040 <https://github.com/pypa/pip/issues/12040>`_)
Bug Fixes
---------
- Fix ``pip completion --zsh``. (`#11417 <https://github.com/pypa/pip/issues/11417>`_)
- Prevent downloading files twice when :pep:`658` metadata is present (`#11847 <https://github.com/pypa/pip/issues/11847>`_)
- Add permission check before configuration (`#11920 <https://github.com/pypa/pip/issues/11920>`_)
- Fix deprecation warnings in Python 3.12 for usage of shutil.rmtree (`#11957 <https://github.com/pypa/pip/issues/11957>`_)
- Ignore invalid or unreadable ``origin.json`` files in the cache of locally built wheels. (`#11985 <https://github.com/pypa/pip/issues/11985>`_)
- Fix installation of packages with :pep:`658` metadata using non-canonicalized names (`#12038 <https://github.com/pypa/pip/issues/12038>`_)
- Correctly parse ``dist-info-metadata`` values from JSON-format index data. (`#12042 <https://github.com/pypa/pip/issues/12042>`_)
- Fail with an error if the ``--python`` option is specified after the subcommand name. (`#12067 <https://github.com/pypa/pip/issues/12067>`_)
- Fix slowness when using ``importlib.metadata`` (the default way for pip to read metadata in Python 3.11+) and there is a large overlap between already installed and to-be-installed packages. (`#12079 <https://github.com/pypa/pip/issues/12079>`_)
- Pass the ``-r`` flag to mercurial to be explicit that a revision is passed and protect
against ``hg`` options injection as part of VCS URLs. Users that do not have control on
VCS URLs passed to pip are advised to upgrade. (`#12119 <https://github.com/pypa/pip/issues/12119>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2023.5.7
- Upgrade platformdirs to 3.8.1
- Upgrade pygments to 2.15.1
- Upgrade pyparsing to 3.1.0
- Upgrade Requests to 2.31.0
- Upgrade rich to 13.4.2
- Upgrade setuptools to 68.0.0
- Updated typing_extensions to 4.6.0
- Upgrade typing_extensions to 4.7.1
- Upgrade urllib3 to 1.26.16
23.1.2 (2023-04-26)
===================
Vendored Libraries
------------------
- Upgrade setuptools to 67.7.2
23.1.1 (2023-04-22)
===================
Bug Fixes
---------
- Revert `#11487 <https://github.com/pypa/pip/pull/11487>`_, as it causes issues with virtualenvs created by the Windows Store distribution of Python. (`#11987 <https://github.com/pypa/pip/issues/11987>`_)
Vendored Libraries
------------------
- Revert pkg_resources (via setuptools) back to 65.6.3
Improved Documentation
----------------------
- Update documentation to reflect the new behavior of using the cache of locally
built wheels in hash-checking mode. (`#11967 <https://github.com/pypa/pip/issues/11967>`_)
23.1 (2023-04-15)
=================
Deprecations and Removals
-------------------------
- Remove support for the deprecated ``--install-options``. (`#11358 <https://github.com/pypa/pip/issues/11358>`_)
- ``--no-binary`` does not imply ``setup.py install`` anymore. Instead a wheel will be
built locally and installed. (`#11451 <https://github.com/pypa/pip/issues/11451>`_)
- ``--no-binary`` does not disable the cache of locally built wheels anymore. It only
means "don't download wheels". (`#11453 <https://github.com/pypa/pip/issues/11453>`_)
- Deprecate ``--build-option`` and ``--global-option``. Users are invited to switch to
``--config-settings``. (`#11859 <https://github.com/pypa/pip/issues/11859>`_)
- Using ``--config-settings`` with projects that don't have a ``pyproject.toml`` now prints
a deprecation warning. In the future the presence of config settings will automatically
enable the default build backend for legacy projects and pass the settings to it. (`#11915 <https://github.com/pypa/pip/issues/11915>`_)
- Remove ``setup.py install`` fallback when building a wheel failed for projects without
``pyproject.toml``. (`#8368 <https://github.com/pypa/pip/issues/8368>`_)
- When the ``wheel`` package is not installed, pip now uses the default build backend
instead of ``setup.py install`` and ``setup.py develop`` for project without
``pyproject.toml``. (`#8559 <https://github.com/pypa/pip/issues/8559>`_)
Features
--------
- Specify egg-link location in assertion message when it does not match installed location to provide better error message for debugging. (`#10476 <https://github.com/pypa/pip/issues/10476>`_)
- Present conflict information during installation after each choice that is rejected (pass ``-vv`` to ``pip install`` to show it) (`#10937 <https://github.com/pypa/pip/issues/10937>`_)
- Display dependency chain on each Collecting/Processing log line. (`#11169 <https://github.com/pypa/pip/issues/11169>`_)
- Support a per-requirement ``--config-settings`` option in requirements files. (`#11325 <https://github.com/pypa/pip/issues/11325>`_)
- The ``--config-settings``/``-C`` option now supports using the same key multiple
times. When the same key is specified multiple times, all values are passed to
the build backend as a list, as opposed to the previous behavior, where pip would
only pass the last value if the same key was used multiple times. (`#11681 <https://github.com/pypa/pip/issues/11681>`_)
- Add ``-C`` as a short version of the ``--config-settings`` option. (`#11786 <https://github.com/pypa/pip/issues/11786>`_)
- Reduce the number of resolver rounds, since backjumping makes the resolver more efficient in finding solutions. This also makes pathological cases fail quicker. (`#11908 <https://github.com/pypa/pip/issues/11908>`_)
- Warn if ``--hash`` is used on a line without requirement in a requirements file. (`#11935 <https://github.com/pypa/pip/issues/11935>`_)
- Stop propagating CLI ``--config-settings`` to the build dependencies. They already did
not propagate to requirements provided in requirement files. To pass the same config
settings to several requirements, users should provide the requirements as CLI
arguments. (`#11941 <https://github.com/pypa/pip/issues/11941>`_)
- Support wheel cache when using ``--require-hashes``. (`#5037 <https://github.com/pypa/pip/issues/5037>`_)
- Add ``--keyring-provider`` flag. See the Authentication page in the documentation for more info. (`#8719 <https://github.com/pypa/pip/issues/8719>`_)
- In the case of virtual environments, configuration files are now also included from the base installation. (`#9752 <https://github.com/pypa/pip/issues/9752>`_)
Bug Fixes
---------
- Fix grammar by changing "A new release of pip available:" to "A new release of pip is available:" in the notice used for indicating that. (`#11529 <https://github.com/pypa/pip/issues/11529>`_)
- Normalize paths before checking if installed scripts are on PATH. (`#11719 <https://github.com/pypa/pip/issues/11719>`_)
- Correct the way to decide if keyring is available. (`#11774 <https://github.com/pypa/pip/issues/11774>`_)
- More consistent resolution backtracking by removing legacy hack related to setuptools resolution (`#11837 <https://github.com/pypa/pip/issues/11837>`_)
- Include ``AUTHORS.txt`` in pip's wheels. (`#11882 <https://github.com/pypa/pip/issues/11882>`_)
- The ``uninstall`` and ``install --force-reinstall`` commands no longer call
``normalize_path()`` repeatedly on the same paths. Instead, these results are
cached for the duration of an uninstall operation, resulting in improved
performance, particularly on Windows. (`#11889 <https://github.com/pypa/pip/issues/11889>`_)
- Fix and improve the parsing of hashes embedded in URL fragments. (`#11936 <https://github.com/pypa/pip/issues/11936>`_)
- When package A depends on package B provided as a direct URL dependency including a hash
embedded in the link, the ``--require-hashes`` option did not warn when user supplied hashes
were missing for package B. (`#11938 <https://github.com/pypa/pip/issues/11938>`_)
- Correctly report ``requested_extras`` in the installation report when extras are
specified for a local directory installation. (`#11946 <https://github.com/pypa/pip/issues/11946>`_)
- When installing an archive from a direct URL or local file, populate
``download_info.info.hashes`` in the installation report, in addition to the legacy
``download_info.info.hash`` key. (`#11948 <https://github.com/pypa/pip/issues/11948>`_)
Vendored Libraries
------------------
- Upgrade msgpack to 1.0.5
- Patch pkg_resources to remove dependency on ``jaraco.text``.
- Upgrade platformdirs to 3.2.0
- Upgrade pygments to 2.14.0
- Upgrade resolvelib to 1.0.1
- Upgrade rich to 13.3.3
- Upgrade setuptools to 67.6.1
- Upgrade tenacity to 8.2.2
- Upgrade typing_extensions to 4.5.0
- Upgrade urllib3 to 1.26.15
Improved Documentation
----------------------
- Cross-reference the ``--python`` flag from the ``--prefix`` flag,
and mention limitations of ``--prefix`` regarding script installation. (`#11775 <https://github.com/pypa/pip/issues/11775>`_)
- Add SECURITY.md to make the policy offical. (`#11809 <https://github.com/pypa/pip/issues/11809>`_)
- Add username to Git over SSH example. (`#11838 <https://github.com/pypa/pip/issues/11838>`_)
- Quote extras in the pip install docs to guard shells with default glob
qualifiers, like zsh. (`#11842 <https://github.com/pypa/pip/issues/11842>`_)
- Make it clear that requirements/constraints file can be a URL (`#11954 <https://github.com/pypa/pip/issues/11954>`_)
23.0.1 (2023-02-17)
===================
Features
--------
- Ignore PIP_REQUIRE_VIRTUALENV for ``pip index`` (`#11671 <https://github.com/pypa/pip/issues/11671>`_)
- Implement ``--break-system-packages`` to permit installing packages into
``EXTERNALLY-MANAGED`` Python installations. (`#11780 <https://github.com/pypa/pip/issues/11780>`_)
Bug Fixes
---------
- Improve handling of isolated build environments on platforms that
customize the Python's installation schemes, such as Debian and
Homebrew. (`#11740 <https://github.com/pypa/pip/issues/11740>`_)
- Do not crash in presence of misformatted hash field in ``direct_url.json``. (`#11773 <https://github.com/pypa/pip/issues/11773>`_)
23.0 (2023-01-30)
=================
Features
--------
- Change the hashes in the installation report to be a mapping. Emit the
``archive_info.hashes`` dictionary in ``direct_url.json``. (`#11312 <https://github.com/pypa/pip/issues/11312>`_)
- Implement logic to read the ``EXTERNALLY-MANAGED`` file as specified in :pep:`668`.
This allows a downstream Python distributor to prevent users from using pip to
modify the externally managed environment. (`#11381 <https://github.com/pypa/pip/issues/11381>`_)
- Enable the use of ``keyring`` found on ``PATH``. This allows ``keyring``
installed using ``pipx`` to be used by ``pip``. (`#11589 <https://github.com/pypa/pip/issues/11589>`_)
- The inspect and installation report formats are now declared stable, and their version
has been bumped from ``0`` to ``1``. (`#11757 <https://github.com/pypa/pip/issues/11757>`_)
Bug Fixes
---------
- Wheel cache behavior is restored to match previous versions, allowing the
cache to find existing entries. (`#11527 <https://github.com/pypa/pip/issues/11527>`_)
- Use the "venv" scheme if available to obtain prefixed lib paths. (`#11598 <https://github.com/pypa/pip/issues/11598>`_)
- Deprecated a historical ambiguity in how ``egg`` fragments in URL-style
requirements are formatted and handled. ``egg`` fragments that do not look
like :pep:`508` names now produce a deprecation warning. (`#11617 <https://github.com/pypa/pip/issues/11617>`_)
- Fix scripts path in isolated build environment on Debian. (`#11623 <https://github.com/pypa/pip/issues/11623>`_)
- Make ``pip show`` show the editable location if package is editable (`#11638 <https://github.com/pypa/pip/issues/11638>`_)
- Stop checking that ``wheel`` is present when ``build-system.requires``
is provided without ``build-system.build-backend`` as ``setuptools``
(which we still check for) will inject it anyway. (`#11673 <https://github.com/pypa/pip/issues/11673>`_)
- Fix an issue when an already existing in-memory distribution would cause
exceptions in ``pip install`` (`#11704 <https://github.com/pypa/pip/issues/11704>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2022.12.7
- Upgrade chardet to 5.1.0
- Upgrade colorama to 0.4.6
- Upgrade distro to 1.8.0
- Remove pep517 from vendored packages
- Upgrade platformdirs to 2.6.2
- Add pyproject-hooks 1.0.0
- Upgrade requests to 2.28.2
- Upgrade rich to 12.6.0
- Upgrade urllib3 to 1.26.14
Improved Documentation
----------------------
- Fixed the description of the option "--install-options" in the documentation (`#10265 <https://github.com/pypa/pip/issues/10265>`_)
- Remove mention that editable installs are necessary for pip freeze to report the VCS
URL. (`#11675 <https://github.com/pypa/pip/issues/11675>`_)
- Clarify that the egg URL fragment is only necessary for editable VCS installs, and
otherwise not necessary anymore. (`#11676 <https://github.com/pypa/pip/issues/11676>`_)
22.3.1 (2022-11-05)
===================
Bug Fixes
---------
- Fix entry point generation of ``pip.X``, ``pipX.Y``, and ``easy_install-X.Y``
to correctly account for multi-digit Python version segments (e.g. the "11"
part of 3.11). (`#11547 <https://github.com/pypa/pip/issues/11547>`_)
22.3 (2022-10-15)
=================
Deprecations and Removals
-------------------------
- Deprecate ``--install-options`` which forces pip to use the deprecated ``install``
command of ``setuptools``. (`#11358 <https://github.com/pypa/pip/issues/11358>`_)
- Deprecate installation with 'setup.py install' when no-binary is enabled for
source distributions without 'pyproject.toml'. (`#11452 <https://github.com/pypa/pip/issues/11452>`_)
- Deprecate ```--no-binary`` disabling the wheel cache. (`#11454 <https://github.com/pypa/pip/issues/11454>`_)
- Remove ``--use-feature=2020-resolver`` opt-in flag. This was supposed to be removed in 21.0, but missed during that release cycle. (`#11493 <https://github.com/pypa/pip/issues/11493>`_)
- Deprecate installation with 'setup.py install' when the 'wheel' package is absent for
source distributions without 'pyproject.toml'. (`#8559 <https://github.com/pypa/pip/issues/8559>`_)
- Remove the ability to use ``pip list --outdated`` in combination with ``--format=freeze``. (`#9789 <https://github.com/pypa/pip/issues/9789>`_)
Features
--------
- Use ``shell=True`` for opening the editor with ``pip config edit``. (`#10716 <https://github.com/pypa/pip/issues/10716>`_)
- Use the ``data-dist-info-metadata`` attribute from :pep:`658` to resolve distribution metadata without downloading the dist yet. (`#11111 <https://github.com/pypa/pip/issues/11111>`_)
- Add an option to run the test suite with pip built as a zipapp. (`#11250 <https://github.com/pypa/pip/issues/11250>`_)
- Add a ``--python`` option to allow pip to manage Python environments other
than the one pip is installed in. (`#11320 <https://github.com/pypa/pip/issues/11320>`_)
- Document the new (experimental) zipapp distribution of pip. (`#11459 <https://github.com/pypa/pip/issues/11459>`_)
- Use the much faster 'bzr co --lightweight' to obtain a copy of a Bazaar tree. (`#5444 <https://github.com/pypa/pip/issues/5444>`_)
Bug Fixes
---------
- Fix ``--no-index`` when ``--index-url`` or ``--extra-index-url`` is specified
inside a requirements file. (`#11276 <https://github.com/pypa/pip/issues/11276>`_)
- Ensure that the candidate ``pip`` executable exists, when checking for a new version of pip. (`#11309 <https://github.com/pypa/pip/issues/11309>`_)
- Ignore distributions with invalid ``Name`` in metadata instead of crashing, when
using the ``importlib.metadata`` backend. (`#11352 <https://github.com/pypa/pip/issues/11352>`_)
- Raise RequirementsFileParseError when parsing malformed requirements options that can't be successfully parsed by shlex. (`#11491 <https://github.com/pypa/pip/issues/11491>`_)
- Fix build environment isolation on some system Pythons. (`#6264 <https://github.com/pypa/pip/issues/6264>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2022.9.24
- Upgrade distlib to 0.3.6
- Upgrade idna to 3.4
- Upgrade pep517 to 0.13.0
- Upgrade pygments to 2.13.0
- Upgrade tenacity to 8.1.0
- Upgrade typing_extensions to 4.4.0
- Upgrade urllib3 to 1.26.12
Improved Documentation
----------------------
- Mention that --quiet must be used when writing the installation report to stdout. (`#11357 <https://github.com/pypa/pip/issues/11357>`_)
22.2.2 (2022-08-03)
===================
Bug Fixes
---------
- Avoid ``AttributeError`` when removing the setuptools-provided ``_distutils_hack`` and it is missing its implementation. (`#11314 <https://github.com/pypa/pip/issues/11314>`_)
- Fix import error when reinstalling pip in user site. (`#11319 <https://github.com/pypa/pip/issues/11319>`_)
- Show pip deprecation warnings by default. (`#11330 <https://github.com/pypa/pip/issues/11330>`_)
22.2.1 (2022-07-27)
===================
Bug Fixes
---------
- Send the pip upgrade prompt to stderr. (`#11282 <https://github.com/pypa/pip/issues/11282>`_)
- Ensure that things work correctly in environments where setuptools-injected
``distutils`` is available by default. This is done by cooperating with
setuptools' injection logic to ensure that pip uses the ``distutils`` from the
Python standard library instead. (`#11298 <https://github.com/pypa/pip/issues/11298>`_)
- Clarify that ``pip cache``'s wheels-related output is about locally built wheels only. (`#11300 <https://github.com/pypa/pip/issues/11300>`_)
22.2 (2022-07-21)
=================
Deprecations and Removals
-------------------------
- Remove the ``html5lib`` deprecated feature flag. (`#10825 <https://github.com/pypa/pip/issues/10825>`_)
- Remove ``--use-deprecated=backtrack-on-build-failures``. (`#11241 <https://github.com/pypa/pip/issues/11241>`_)
Features
--------
- Add support to use `truststore <https://pypi.org/project/truststore/>`_ as an
alternative SSL certificate verification backend. The backend can be enabled on Python
3.10 and later by installing ``truststore`` into the environment, and adding the
``--use-feature=truststore`` flag to various pip commands.
``truststore`` differs from the current default verification backend (provided by
``certifi``) in it uses the operating system’s trust store, which can be better
controlled and augmented to better support non-standard certificates. Depending on
feedback, pip may switch to this as the default certificate verification backend in
the future. (`#11082 <https://github.com/pypa/pip/issues/11082>`_)
- Add ``--dry-run`` option to ``pip install``, to let it print what it would install but
not actually change anything in the target environment. (`#11096 <https://github.com/pypa/pip/issues/11096>`_)
- Record in wheel cache entries the URL of the original artifact that was downloaded
to build the cached wheels. The record is named ``origin.json`` and uses the PEP 610
Direct URL format. (`#11137 <https://github.com/pypa/pip/issues/11137>`_)
- Support `PEP 691 <https://peps.python.org/pep-0691/>`_. (`#11158 <https://github.com/pypa/pip/issues/11158>`_)
- pip's deprecation warnings now subclass the built-in ``DeprecationWarning``, and
can be suppressed by running the Python interpreter with
``-W ignore::DeprecationWarning``. (`#11225 <https://github.com/pypa/pip/issues/11225>`_)
- Add ``pip inspect`` command to obtain the list of installed distributions and other
information about the Python environment, in JSON format. (`#11245 <https://github.com/pypa/pip/issues/11245>`_)
- Significantly speed up isolated environment creation, by using the same
sources for pip instead of creating a standalone installation for each
environment. (`#11257 <https://github.com/pypa/pip/issues/11257>`_)
- Add an experimental ``--report`` option to the install command to generate a JSON report
of what was installed. In combination with ``--dry-run`` and ``--ignore-installed`` it
can be used to resolve the requirements. (`#53 <https://github.com/pypa/pip/issues/53>`_)
Bug Fixes
---------
- Fix ``pip install --pre`` for packages with pre-release build dependencies defined
both in ``pyproject.toml``'s ``build-system.requires`` and ``setup.py``'s
``setup_requires``. (`#10222 <https://github.com/pypa/pip/issues/10222>`_)
- When pip rewrites the shebang line in a script during wheel installation,
update the hash and size in the corresponding ``RECORD`` file entry. (`#10744 <https://github.com/pypa/pip/issues/10744>`_)
- Do not consider a ``.dist-info`` directory found inside a wheel-like zip file
as metadata for an installed distribution. A package in a wheel is (by
definition) not installed, and is not guaranteed to work due to how a wheel is
structured. (`#11217 <https://github.com/pypa/pip/issues/11217>`_)
- Use ``importlib.resources`` to read the ``vendor.txt`` file in ``pip debug``.
This makes the command safe for use from a zipapp. (`#11248 <https://github.com/pypa/pip/issues/11248>`_)
- Make the ``--use-pep517`` option of the ``download`` command apply not just
to the requirements specified on the command line, but to their dependencies,
as well. (`#9523 <https://github.com/pypa/pip/issues/9523>`_)
Process
-------
- Remove reliance on the stdlib cgi module, which is deprecated in Python 3.11.
Vendored Libraries
------------------
- Remove html5lib.
- Upgrade certifi to 2022.6.15
- Upgrade chardet to 5.0.0
- Upgrade colorama to 0.4.5
- Upgrade distlib to 0.3.5
- Upgrade msgpack to 1.0.4
- Upgrade pygments to 2.12.0
- Upgrade pyparsing to 3.0.9
- Upgrade requests to 2.28.1
- Upgrade rich to 12.5.1
- Upgrade typing_extensions to 4.3.0
- Upgrade urllib3 to 1.26.10
22.1.2 (2022-05-31)
===================
Bug Fixes
---------
- Revert `#10979 <https://github.com/pypa/pip/issues/10979>`_ since it introduced a regression in certain edge cases. (`#10979 <https://github.com/pypa/pip/issues/10979>`_)
- Fix an incorrect assertion in the logging logic, that prevented the upgrade prompt from being presented. (`#11136 <https://github.com/pypa/pip/issues/11136>`_)
22.1.1 (2022-05-20)
===================
Bug Fixes
---------
- Properly filter out optional dependencies (i.e. extras) when checking build environment distributions. (`#11112 <https://github.com/pypa/pip/issues/11112>`_)
- Change the build environment dependency checking to be opt-in. (`#11116 <https://github.com/pypa/pip/issues/11116>`_)
- Allow using a pre-release version to satisfy a build requirement. This helps
manually populated build environments to more accurately detect build-time
requirement conflicts. (`#11123 <https://github.com/pypa/pip/issues/11123>`_)
22.1 (2022-05-11)
=================
Process
-------
- Enable the ``importlib.metadata`` metadata implementation by default on
Python 3.11 (or later). The environment variable ``_PIP_USE_IMPORTLIB_METADATA``
can still be used to enable the implementation on 3.10 and earlier, or disable
it on 3.11 (by setting it to ``0`` or ``false``).
Bug Fixes
---------
- Revert `#9243 <https://github.com/pypa/pip/issues/9243>`_ since it introduced a regression in certain edge cases. (`#10962 <https://github.com/pypa/pip/issues/10962>`_)
- Fix missing ``REQUESTED`` metadata when using URL constraints. (`#11079 <https://github.com/pypa/pip/issues/11079>`_)
- ``pip config`` now normalizes names by converting underscores into dashes. (`#9330 <https://github.com/pypa/pip/issues/9330>`_)
22.1b1 (2022-04-30)
===================
Process
-------
- Start migration of distribution metadata implementation from ``pkg_resources``
to ``importlib.metadata``. The new implementation is currently not exposed in
any user-facing way, but included in the code base for easier development.
Deprecations and Removals
-------------------------
- Drop ``--use-deprecated=out-of-tree-build``, according to deprecation message. (`#11001 <https://github.com/pypa/pip/issues/11001>`_)
Features
--------
- Add option to install and uninstall commands to opt-out from running-as-root warning. (`#10556 <https://github.com/pypa/pip/issues/10556>`_)
- Include Project-URLs in ``pip show`` output. (`#10799 <https://github.com/pypa/pip/issues/10799>`_)
- Improve error message when ``pip config edit`` is provided an editor that
doesn't exist. (`#10812 <https://github.com/pypa/pip/issues/10812>`_)
- Add a user interface for supplying config settings to build backends. (`#11059 <https://github.com/pypa/pip/issues/11059>`_)
- Add support for Powershell autocompletion. (`#9024 <https://github.com/pypa/pip/issues/9024>`_)
- Explains why specified version cannot be retrieved when *Requires-Python* is not satisfied. (`#9615 <https://github.com/pypa/pip/issues/9615>`_)
- Validate build dependencies when using ``--no-build-isolation``. (`#9794 <https://github.com/pypa/pip/issues/9794>`_)
Bug Fixes
---------
- Fix conditional checks to prevent ``pip.exe`` from trying to modify itself, on Windows. (`#10560 <https://github.com/pypa/pip/issues/10560>`_)
- Fix uninstall editable from Windows junction link. (`#10696 <https://github.com/pypa/pip/issues/10696>`_)
- Fallback to pyproject.toml-based builds if ``setup.py`` is present in a project, but ``setuptools`` cannot be imported. (`#10717 <https://github.com/pypa/pip/issues/10717>`_)
- When checking for conflicts in the build environment, correctly skip requirements
containing markers that do not match the current environment. (`#10883 <https://github.com/pypa/pip/issues/10883>`_)
- Disable brotli import in vendored urllib3 so brotli could be uninstalled/upgraded by pip. (`#10950 <https://github.com/pypa/pip/issues/10950>`_)
- Prioritize URL credentials over netrc. (`#10979 <https://github.com/pypa/pip/issues/10979>`_)
- Filter available distributions using hash declarations from constraints files. (`#9243 <https://github.com/pypa/pip/issues/9243>`_)
- Fix an error when trying to uninstall packages installed as editable from a network drive. (`#9452 <https://github.com/pypa/pip/issues/9452>`_)
- Fix pip install issues using a proxy due to an inconsistency in how Requests is currently handling variable precedence in session. (`#9691 <https://github.com/pypa/pip/issues/9691>`_)
Vendored Libraries
------------------
- Upgrade CacheControl to 0.12.11
- Upgrade distro to 1.7.0
- Upgrade platformdirs to 2.5.2
- Remove ``progress`` from vendored dependencies.
- Upgrade ``pyparsing`` to 3.0.8 for startup performance improvements.
- Upgrade rich to 12.2.0
- Upgrade tomli to 2.0.1
- Upgrade typing_extensions to 4.2.0
Improved Documentation
----------------------
- Add more dedicated topic and reference pages to the documentation. (`#10899 <https://github.com/pypa/pip/issues/10899>`_)
- Capitalise Y as the default for "Proceed (y/n)?" when uninstalling. (`#10936 <https://github.com/pypa/pip/issues/10936>`_)
- Add ``scheme://`` requirement to ``--proxy`` option's description (`#10951 <https://github.com/pypa/pip/issues/10951>`_)
- The wheel command now references the build interface section instead of stating the legacy
setuptools behavior as the default. (`#10972 <https://github.com/pypa/pip/issues/10972>`_)
- Improved usefulness of ``pip config --help`` output. (`#11074 <https://github.com/pypa/pip/issues/11074>`_)
22.0.4 (2022-03-06)
===================
Deprecations and Removals
-------------------------
- Drop the doctype check, that presented a warning for index pages that use non-compliant HTML 5. (`#10903 <https://github.com/pypa/pip/issues/10903>`_)
Vendored Libraries
------------------
- Downgrade distlib to 0.3.3.
22.0.3 (2022-02-03)
===================
Features
--------
- Print the exception via ``rich.traceback``, when running with ``--debug``. (`#10791 <https://github.com/pypa/pip/issues/10791>`_)
Bug Fixes
---------
- Only calculate topological installation order, for packages that are going to be installed/upgraded.
This fixes an `AssertionError` that occurred when determining installation order, for a very specific combination of upgrading-already-installed-package + change of dependencies + fetching some packages from a package index. This combination was especially common in Read the Docs' builds. (`#10851 <https://github.com/pypa/pip/issues/10851>`_)
- Use ``html.parser`` by default, instead of falling back to ``html5lib`` when ``--use-deprecated=html5lib`` is not passed. (`#10869 <https://github.com/pypa/pip/issues/10869>`_)
Improved Documentation
----------------------
- Clarify that using per-requirement overrides disables the usage of wheels. (`#9674 <https://github.com/pypa/pip/issues/9674>`_)
22.0.2 (2022-01-30)
===================
Deprecations and Removals
-------------------------
- Instead of failing on index pages that use non-compliant HTML 5, print a deprecation warning and fall back to ``html5lib``-based parsing for now. This simplifies the migration for non-compliant index pages, by letting such indexes function with a warning. (`#10847 <https://github.com/pypa/pip/issues/10847>`_)
22.0.1 (2022-01-30)
===================
Bug Fixes
---------
- Accept lowercase ``<!doctype html>`` on index pages. (`#10844 <https://github.com/pypa/pip/issues/10844>`_)
- Properly handle links parsed by html5lib, when using ``--use-deprecated=html5lib``. (`#10846 <https://github.com/pypa/pip/issues/10846>`_)
22.0 (2022-01-29)
=================
Process
-------
- Completely replace :pypi:`tox` in our development workflow, with :pypi:`nox`.
Deprecations and Removals
-------------------------
- Deprecate alternative progress bar styles, leaving only ``on`` and ``off`` as available choices. (`#10462 <https://github.com/pypa/pip/issues/10462>`_)
- Drop support for Python 3.6. (`#10641 <https://github.com/pypa/pip/issues/10641>`_)
- Disable location mismatch warnings on Python versions prior to 3.10.
These warnings were helping identify potential issues as part of the sysconfig -> distutils transition, and we no longer need to rely on reports from older Python versions for information on the transition. (`#10840 <https://github.com/pypa/pip/issues/10840>`_)
Features
--------
- Changed ``PackageFinder`` to parse HTML documents using the stdlib :class:`html.parser.HTMLParser` class instead of the ``html5lib`` package.
For now, the deprecated ``html5lib`` code remains and can be used with the ``--use-deprecated=html5lib`` command line option. However, it will be removed in a future pip release. (`#10291 <https://github.com/pypa/pip/issues/10291>`_)
- Utilise ``rich`` for presenting pip's default download progress bar. (`#10462 <https://github.com/pypa/pip/issues/10462>`_)
- Present a better error message when an invalid wheel file is encountered, providing more context where the invalid wheel file is. (`#10535 <https://github.com/pypa/pip/issues/10535>`_)
- Documents the ``--require-virtualenv`` flag for ``pip install``. (`#10588 <https://github.com/pypa/pip/issues/10588>`_)
- ``pip install <tab>`` autocompletes paths. (`#10646 <https://github.com/pypa/pip/issues/10646>`_)
- Allow Python distributors to opt-out from or opt-in to the ``sysconfig`` installation scheme backend by setting ``sysconfig._PIP_USE_SYSCONFIG`` to ``True`` or ``False``. (`#10647 <https://github.com/pypa/pip/issues/10647>`_)
- Make it possible to deselect tests requiring cryptography package on systems where it cannot be installed. (`#10686 <https://github.com/pypa/pip/issues/10686>`_)
- Start using Rich for presenting error messages in a consistent format. (`#10703 <https://github.com/pypa/pip/issues/10703>`_)
- Improve presentation of errors from subprocesses. (`#10705 <https://github.com/pypa/pip/issues/10705>`_)
- Forward pip's verbosity configuration to VCS tools to control their output accordingly. (`#8819 <https://github.com/pypa/pip/issues/8819>`_)
Bug Fixes
---------
- Optimize installation order calculation to improve performance when installing requirements that form a complex dependency graph with a large amount of edges. (`#10557 <https://github.com/pypa/pip/issues/10557>`_)
- When a package is requested by the user for upgrade, correctly identify that the extra-ed variant of that same package depended by another user-requested package is requesting the same package, and upgrade it accordingly. (`#10613 <https://github.com/pypa/pip/issues/10613>`_)
- Prevent pip from installing yanked releases unless explicitly pinned via the ``==`` or ``===`` operators. (`#10617 <https://github.com/pypa/pip/issues/10617>`_)
- Stop backtracking on build failures, by instead surfacing them to the user and aborting immediately. This behaviour provides more immediate feedback when a package cannot be built due to missing build dependencies or platform incompatibility. (`#10655 <https://github.com/pypa/pip/issues/10655>`_)
- Silence ``Value for <location> does not match`` warning caused by an erroneous patch in Slackware-distributed Python 3.9. (`#10668 <https://github.com/pypa/pip/issues/10668>`_)
- Fix an issue where pip did not consider dependencies with and without extras to be equal (`#9644 <https://github.com/pypa/pip/issues/9644>`_)
Vendored Libraries
------------------
- Upgrade CacheControl to 0.12.10
- Upgrade certifi to 2021.10.8
- Upgrade distlib to 0.3.4
- Upgrade idna to 3.3
- Upgrade msgpack to 1.0.3
- Upgrade packaging to 21.3
- Upgrade platformdirs to 2.4.1
- Add pygments 2.11.2 as a vendored dependency.
- Tree-trim unused portions of vendored pygments, to reduce the distribution size.
- Upgrade pyparsing to 3.0.7
- Upgrade Requests to 2.27.1
- Upgrade resolvelib to 0.8.1
- Add rich 11.0.0 as a vendored dependency.
- Tree-trim unused portions of vendored rich, to reduce the distribution size.
- Add typing_extensions 4.0.1 as a vendored dependency.
- Upgrade urllib3 to 1.26.8
21.3.1 (2021-10-22)
===================
Bug Fixes
---------
- Always refuse installing or building projects that have no ``pyproject.toml`` nor
``setup.py``. (`#10531 <https://github.com/pypa/pip/issues/10531>`_)
- Tweak running-as-root detection, to check ``os.getuid`` if it exists, on Unix-y and non-Linux/non-MacOS machines. (`#10565 <https://github.com/pypa/pip/issues/10565>`_)
- When installing projects with a ``pyproject.toml`` in editable mode, and the build
backend does not support :pep:`660`, prepare metadata using
``prepare_metadata_for_build_wheel`` instead of ``setup.py egg_info``. Also, refuse
installing projects that only have a ``setup.cfg`` and no ``setup.py`` nor
``pyproject.toml``. These restore the pre-21.3 behaviour. (`#10573 <https://github.com/pypa/pip/issues/10573>`_)
- Restore compatibility of where configuration files are loaded from on MacOS (back to ``Library/Application Support/pip``, instead of ``Preferences/pip``). (`#10585 <https://github.com/pypa/pip/issues/10585>`_)
Vendored Libraries
------------------
- Upgrade pep517 to 0.12.0
21.3 (2021-10-11)
=================
Deprecations and Removals
-------------------------
- Improve deprecation warning regarding the copying of source trees when installing from a local directory. (`#10128 <https://github.com/pypa/pip/issues/10128>`_)
- Suppress location mismatch warnings when pip is invoked from a Python source
tree, so ``ensurepip`` does not emit warnings on CPython ``make install``. (`#10270 <https://github.com/pypa/pip/issues/10270>`_)
- On Python 3.10 or later, the installation scheme backend has been changed to use
``sysconfig``. This is to anticipate the deprecation of ``distutils`` in Python
3.10, and its scheduled removal in 3.12. For compatibility considerations, pip
installations running on Python 3.9 or lower will continue to use ``distutils``. (`#10358 <https://github.com/pypa/pip/issues/10358>`_)
- Remove the ``--build-dir`` option and aliases, one last time. (`#10485 <https://github.com/pypa/pip/issues/10485>`_)
- In-tree builds are now the default. ``--use-feature=in-tree-build`` is now
ignored. ``--use-deprecated=out-of-tree-build`` may be used temporarily to ease
the transition. (`#10495 <https://github.com/pypa/pip/issues/10495>`_)
- Un-deprecate source distribution re-installation behaviour. (`#8711 <https://github.com/pypa/pip/issues/8711>`_)
Features
--------
- Replace vendored appdirs with platformdirs. (`#10202 <https://github.com/pypa/pip/issues/10202>`_)
- Support `PEP 610 <https://www.python.org/dev/peps/pep-0610/>`_ to detect
editable installs in ``pip freeze`` and ``pip list``. The ``pip list`` column output
has a new ``Editable project location`` column, and the JSON output has a new
``editable_project_location`` field. (`#10249 <https://github.com/pypa/pip/issues/10249>`_)
- ``pip freeze`` will now always fallback to reporting the editable project
location when it encounters a VCS error while analyzing an editable
requirement. Before, it sometimes reported the requirement as non-editable. (`#10410 <https://github.com/pypa/pip/issues/10410>`_)
- ``pip show`` now sorts ``Requires`` and ``Required-By`` alphabetically. (`#10422 <https://github.com/pypa/pip/issues/10422>`_)
- Do not raise error when there are no files to remove with ``pip cache purge/remove``.
Instead log a warning and continue (to log that we removed 0 files). (`#10459 <https://github.com/pypa/pip/issues/10459>`_)
- When backtracking during dependency resolution, prefer the dependencies which are involved in the most recent conflict. This can significantly reduce the amount of backtracking required. (`#10479 <https://github.com/pypa/pip/issues/10479>`_)
- Cache requirement objects, to improve performance reducing reparses of requirement strings. (`#10550 <https://github.com/pypa/pip/issues/10550>`_)
- Support editable installs for projects that have a ``pyproject.toml`` and use a
build backend that supports :pep:`660`. (`#8212 <https://github.com/pypa/pip/issues/8212>`_)
- When a revision is specified in a Git URL, use git's partial clone feature to speed up source retrieval. (`#9086 <https://github.com/pypa/pip/issues/9086>`_)
- Add a ``--debug`` flag, to enable a mode that doesn't log errors and propagates them to the top level instead. This is primarily to aid with debugging pip's crashes. (`#9349 <https://github.com/pypa/pip/issues/9349>`_)
- If a host is explicitly specified as trusted by the user (via the --trusted-host option), cache HTTP responses from it in addition to HTTPS ones. (`#9498 <https://github.com/pypa/pip/issues/9498>`_)
Bug Fixes
---------
- Present a better error message, when a ``file:`` URL is not found. (`#10263 <https://github.com/pypa/pip/issues/10263>`_)
- Fix the auth credential cache to allow for the case in which
the index url contains the username, but the password comes
from an external source, such as keyring. (`#10269 <https://github.com/pypa/pip/issues/10269>`_)
- Fix double unescape of HTML ``data-requires-python`` and ``data-yanked`` attributes. (`#10378 <https://github.com/pypa/pip/issues/10378>`_)
- New resolver: Fixes depth ordering of packages during resolution, e.g. a dependency 2 levels deep will be ordered before a dependency 3 levels deep. (`#10482 <https://github.com/pypa/pip/issues/10482>`_)
- Correctly indent metadata preparation messages in pip output. (`#10524 <https://github.com/pypa/pip/issues/10524>`_)
Vendored Libraries
------------------
- Remove appdirs as a vendored dependency.
- Upgrade distlib to 0.3.3
- Upgrade distro to 1.6.0
- Patch pkg_resources to use platformdirs rather than appdirs.
- Add platformdirs as a vendored dependency.
- Upgrade progress to 1.6
- Upgrade resolvelib to 0.8.0
- Upgrade urllib3 to 1.26.7
Improved Documentation
----------------------
- Update links of setuptools as setuptools moved these documents. The Simple Repository link now points to PyPUG as that is the canonical place of packaging specification, and setuptools's ``easy_install`` is deprecated. (`#10430 <https://github.com/pypa/pip/issues/10430>`_)
- Create a "Build System Interface" reference section, for documenting how pip interacts with build systems. (`#10497 <https://github.com/pypa/pip/issues/10497>`_)
21.2.4 (2021-08-12)
===================
Bug Fixes
---------
- Fix 3.6.0 compatibility in link comparison logic. (`#10280 <https://github.com/pypa/pip/issues/10280>`_)
21.2.3 (2021-08-06)
===================
Bug Fixes
---------
- Modify the ``sysconfig.get_preferred_scheme`` function check to be
compatible with CPython 3.10’s alphareleases. (`#10252 <https://github.com/pypa/pip/issues/10252>`_)
21.2.2 (2021-07-31)
===================
Bug Fixes
---------
- New resolver: When a package is specified with extras in constraints, and with
extras in non-constraint requirements, the resolver now correctly identifies the
constraint's existence and avoids backtracking. (`#10233 <https://github.com/pypa/pip/issues/10233>`_)
21.2.1 (2021-07-25)
===================
Process
-------
- The source distribution re-installation feature removal has been delayed to 21.3.
21.2 (2021-07-24)
=================
Process
-------
- ``pip freeze``, ``pip list``, and ``pip show`` no longer normalize underscore
(``_``) in distribution names to dash (``-``). This is a side effect of the
migration to ``importlib.metadata``, since the underscore-dash normalization
behavior is non-standard and specific to setuptools. This should not affect
other parts of pip (for example, when feeding the ``pip freeze`` result back
into ``pip install``) since pip internally performs standard PEP 503
normalization independently to setuptools.
Deprecations and Removals
-------------------------
- Git version parsing is now done with regular expression to prepare for the
pending upstream removal of non-PEP-440 version parsing logic. (`#10117 <https://github.com/pypa/pip/issues/10117>`_)
- Re-enable the "Value for ... does not match" location warnings to field a new
round of feedback for the ``distutils``-``sysconfig`` transition. (`#10151 <https://github.com/pypa/pip/issues/10151>`_)
- Remove deprecated ``--find-links`` option in ``pip freeze`` (`#9069 <https://github.com/pypa/pip/issues/9069>`_)
Features
--------
- New resolver: Loosen URL comparison logic when checking for direct URL reference
equivalency. The logic includes the following notable characteristics:
* The authentication part of the URL is explicitly ignored.
* Most of the fragment part, including ``egg=``, is explicitly ignored. Only
``subdirectory=`` and hash values (e.g. ``sha256=``) are kept.
* The query part of the URL is parsed to allow ordering differences. (`#10002 <https://github.com/pypa/pip/issues/10002>`_)
- Support TOML v1.0.0 syntax in ``pyproject.toml``. (`#10034 <https://github.com/pypa/pip/issues/10034>`_)
- Added a warning message for errors caused due to Long Paths being disabled on Windows. (`#10045 <https://github.com/pypa/pip/issues/10045>`_)
- Change the encoding of log file from default text encoding to UTF-8. (`#10071 <https://github.com/pypa/pip/issues/10071>`_)
- Log the resolved commit SHA when installing a package from a Git repository. (`#10149 <https://github.com/pypa/pip/issues/10149>`_)
- Add a warning when passing an invalid requirement to ``pip uninstall``. (`#4958 <https://github.com/pypa/pip/issues/4958>`_)
- Add new subcommand ``pip index`` used to interact with indexes, and implement
``pip index version`` to list available versions of a package. (`#7975 <https://github.com/pypa/pip/issues/7975>`_)
- When pip is asked to uninstall a project without the dist-info/RECORD file
it will no longer traceback with FileNotFoundError,
but it will provide a better error message instead, such as::
ERROR: Cannot uninstall foobar 0.1, RECORD file not found. You might be able to recover from this via: 'pip install --force-reinstall --no-deps foobar==0.1'.
When dist-info/INSTALLER is present and contains some useful information, the info is included in the error message instead::
ERROR: Cannot uninstall foobar 0.1, RECORD file not found. Hint: The package was installed by rpm.
(`#8954 <https://github.com/pypa/pip/issues/8954>`_)
- Add an additional level of verbosity. ``--verbose`` (and the shorthand ``-v``) now
contains significantly less output, and users that need complete full debug-level output
should pass it twice (``--verbose --verbose`` or ``-vv``). (`#9450 <https://github.com/pypa/pip/issues/9450>`_)
- New resolver: The order of dependencies resolution has been tweaked to traverse
the dependency graph in a more breadth-first approach. (`#9455 <https://github.com/pypa/pip/issues/9455>`_)
- Make "yes" the default choice in ``pip uninstall``'s prompt. (`#9686 <https://github.com/pypa/pip/issues/9686>`_)
- Add a special error message when users forget the ``-r`` flag when installing. (`#9915 <https://github.com/pypa/pip/issues/9915>`_)
- New resolver: A distribution's ``Requires-Python`` metadata is now checked
before its Python dependencies. This makes the resolver fail quicker when
there's an interpreter version conflict. (`#9925 <https://github.com/pypa/pip/issues/9925>`_)
- Suppress "not on PATH" warning when ``--prefix`` is given. (`#9931 <https://github.com/pypa/pip/issues/9931>`_)
- Include ``rustc`` version in pip's ``User-Agent``, when the system has ``rustc``. (`#9987 <https://github.com/pypa/pip/issues/9987>`_)
Bug Fixes
---------
- Update vendored six to 1.16.0 and urllib3 to 1.26.5 (`#10043 <https://github.com/pypa/pip/issues/10043>`_)
- Correctly allow PEP 517 projects to be detected without warnings in ``pip freeze``. (`#10080 <https://github.com/pypa/pip/issues/10080>`_)
- Strip leading slash from a ``file://`` URL built from an path with the Windows
drive notation. This fixes bugs where the ``file://`` URL cannot be correctly
used as requirement, constraint, or index URLs on Windows. (`#10115 <https://github.com/pypa/pip/issues/10115>`_)
- New resolver: URL comparison logic now treats ``file://localhost/`` and
``file:///`` as equivalent to conform to RFC 8089. (`#10162 <https://github.com/pypa/pip/issues/10162>`_)
- Prefer credentials from the URL over the previously-obtained credentials from URLs of the same domain, so it is possible to use different credentials on the same index server for different ``--extra-index-url`` options. (`#3931 <https://github.com/pypa/pip/issues/3931>`_)
- Fix extraction of files with utf-8 encoded paths from tars. (`#7667 <https://github.com/pypa/pip/issues/7667>`_)
- Skip distutils configuration parsing on encoding errors. (`#8931 <https://github.com/pypa/pip/issues/8931>`_)
- New resolver: Detect an unnamed requirement is user-specified (by building its
metadata for the project name) so it can be correctly ordered in the resolver. (`#9204 <https://github.com/pypa/pip/issues/9204>`_)
- Fix :ref:`pip freeze` to output packages :ref:`installed from git <vcs support>`
in the correct ``git+protocol://git.example.com/MyProject#egg=MyProject`` format
rather than the old and no longer supported ``git+git@`` format. (`#9822 <https://github.com/pypa/pip/issues/9822>`_)
- Fix warnings about install scheme selection for Python framework builds
distributed by Apple's Command Line Tools. (`#9844 <https://github.com/pypa/pip/issues/9844>`_)
- Relax interpreter detection to quelch a location mismatch warning where PyPy
is deliberately breaking backwards compatibility. (`#9845 <https://github.com/pypa/pip/issues/9845>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2021.05.30.
- Upgrade idna to 3.2.
- Upgrade packaging to 21.0
- Upgrade requests to 2.26.0.
- Upgrade resolvelib to 0.7.1.
- Upgrade urllib3 to 1.26.6.
21.1.3 (2021-06-26)
===================
Bug Fixes
---------
- Remove unused optional ``tornado`` import in vendored ``tenacity`` to prevent old versions of Tornado from breaking pip. (`#10020 <https://github.com/pypa/pip/issues/10020>`_)
- Require ``setup.cfg``-only projects to be built via PEP 517, by requiring an explicit dependency on setuptools declared in pyproject.toml. (`#10031 <https://github.com/pypa/pip/issues/10031>`_)
21.1.2 (2021-05-23)
===================
Bug Fixes
---------
- New resolver: Correctly exclude an already installed package if its version is
known to be incompatible to stop the dependency resolution process with a clear
error message. (`#9841 <https://github.com/pypa/pip/issues/9841>`_)
- Allow ZIP to archive files with timestamps earlier than 1980. (`#9910 <https://github.com/pypa/pip/issues/9910>`_)
- Emit clearer error message when a project root does not contain either
``pyproject.toml``, ``setup.py`` or ``setup.cfg``. (`#9944 <https://github.com/pypa/pip/issues/9944>`_)
- Fix detection of existing standalone pip instance for PEP 517 builds. (`#9953 <https://github.com/pypa/pip/issues/9953>`_)
21.1.1 (2021-04-30)
===================
Deprecations and Removals
-------------------------
- Temporarily set the new "Value for ... does not match" location warnings level
to *DEBUG*, to hide them from casual users. This prepares pip 21.1 for CPython
inclusion, while pip maintainers digest the first intake of location mismatch
issues for the ``distutils``-``sysconfig`` transition. (`#9912 <https://github.com/pypa/pip/issues/9912>`_)
Bug Fixes
---------
- This change fixes a bug on Python <=3.6.1 with a Typing feature added in 3.6.2 (`#9831 <https://github.com/pypa/pip/issues/9831>`_)
- Fix compatibility between distutils and sysconfig when the project name is unknown outside of a virtual environment. (`#9838 <https://github.com/pypa/pip/issues/9838>`_)
- Fix Python 3.6 compatibility when a PEP 517 build requirement itself needs to be
built in an isolated environment. (`#9878 <https://github.com/pypa/pip/issues/9878>`_)
21.1 (2021-04-24)
=================
Process
-------
- Start installation scheme migration from ``distutils`` to ``sysconfig``. A
warning is implemented to detect differences between the two implementations to
encourage user reports, so we can avoid breakages before they happen.
Features
--------
- Add the ability for the new resolver to process URL constraints. (`#8253 <https://github.com/pypa/pip/issues/8253>`_)
- Add a feature ``--use-feature=in-tree-build`` to build local projects in-place
when installing. This is expected to become the default behavior in pip 21.3;
see `Installing from local packages <https://pip.pypa.io/en/stable/user_guide/#installing-from-local-packages>`_
for more information. (`#9091 <https://github.com/pypa/pip/issues/9091>`_)
- Bring back the "(from versions: ...)" message, that was shown on resolution failures. (`#9139 <https://github.com/pypa/pip/issues/9139>`_)
- Add support for editable installs for project with only setup.cfg files. (`#9547 <https://github.com/pypa/pip/issues/9547>`_)
- Improve performance when picking the best file from indexes during ``pip install``. (`#9748 <https://github.com/pypa/pip/issues/9748>`_)
- Warn instead of erroring out when doing a PEP 517 build in presence of
``--build-option``. Warn when doing a PEP 517 build in presence of
``--global-option``. (`#9774 <https://github.com/pypa/pip/issues/9774>`_)
Bug Fixes
---------
- Fixed ``--target`` to work with ``--editable`` installs. (`#4390 <https://github.com/pypa/pip/issues/4390>`_)
- Add a warning, discouraging the usage of pip as root, outside a virtual environment. (`#6409 <https://github.com/pypa/pip/issues/6409>`_)
- Ignore ``.dist-info`` directories if the stem is not a valid Python distribution
name, so they don't show up in e.g. ``pip freeze``. (`#7269 <https://github.com/pypa/pip/issues/7269>`_)
- Only query the keyring for URLs that actually trigger error 401.
This prevents an unnecessary keyring unlock prompt on every pip install
invocation (even with default index URL which is not password protected). (`#8090 <https://github.com/pypa/pip/issues/8090>`_)
- Prevent packages already-installed alongside with pip to be injected into an
isolated build environment during build-time dependency population. (`#8214 <https://github.com/pypa/pip/issues/8214>`_)
- Fix ``pip freeze`` permission denied error in order to display an understandable error message and offer solutions. (`#8418 <https://github.com/pypa/pip/issues/8418>`_)
- Correctly uninstall script files (from setuptools' ``scripts`` argument), when installed with ``--user``. (`#8733 <https://github.com/pypa/pip/issues/8733>`_)
- New resolver: When a requirement is requested both via a direct URL
(``req @ URL``) and via version specifier with extras (``req[extra]``), the
resolver will now be able to use the URL to correctly resolve the requirement
with extras. (`#8785 <https://github.com/pypa/pip/issues/8785>`_)
- New resolver: Show relevant entries from user-supplied constraint files in the
error message to improve debuggability. (`#9300 <https://github.com/pypa/pip/issues/9300>`_)
- Avoid parsing version to make the version check more robust against lousily
debundled downstream distributions. (`#9348 <https://github.com/pypa/pip/issues/9348>`_)
- ``--user`` is no longer suggested incorrectly when pip fails with a permission
error in a virtual environment. (`#9409 <https://github.com/pypa/pip/issues/9409>`_)
- Fix incorrect reporting on ``Requires-Python`` conflicts. (`#9541 <https://github.com/pypa/pip/issues/9541>`_)
- Make wheel compatibility tag preferences more important than the build tag (`#9565 <https://github.com/pypa/pip/issues/9565>`_)
- Fix pip to work with warnings converted to errors. (`#9779 <https://github.com/pypa/pip/issues/9779>`_)
- **SECURITY**: Stop splitting on unicode separators in git references,
which could be maliciously used to install a different revision on the
repository. (`#9827 <https://github.com/pypa/pip/issues/9827>`_)
Vendored Libraries
------------------
- Update urllib3 to 1.26.4 to fix CVE-2021-28363
- Remove contextlib2.
- Upgrade idna to 3.1
- Upgrade pep517 to 0.10.0
- Upgrade vendored resolvelib to 0.7.0.
- Upgrade tenacity to 7.0.0
Improved Documentation
----------------------
- Update "setuptools extras" link to match upstream. (`#4822829F-6A45-4202-87BA-A80482DF6D4E <https://github.com/pypa/pip/issues/4822829F-6A45-4202-87BA-A80482DF6D4E>`_)
- Improve SSL Certificate Verification docs and ``--cert`` help text. (`#6720 <https://github.com/pypa/pip/issues/6720>`_)
- Add a section in the documentation to suggest solutions to the ``pip freeze`` permission denied issue. (`#8418 <https://github.com/pypa/pip/issues/8418>`_)
- Add warning about ``--extra-index-url`` and dependency confusion (`#9647 <https://github.com/pypa/pip/issues/9647>`_)
- Describe ``--upgrade-strategy`` and direct requirements explicitly; add a brief
example. (`#9692 <https://github.com/pypa/pip/issues/9692>`_)
21.0.1 (2021-01-30)
===================
Bug Fixes
---------
- commands: debug: Use packaging.version.parse to compare between versions. (`#9461 <https://github.com/pypa/pip/issues/9461>`_)
- New resolver: Download and prepare a distribution only at the last possible
moment to avoid unnecessary network access when the same version is already
installed locally. (`#9516 <https://github.com/pypa/pip/issues/9516>`_)
Vendored Libraries
------------------
- Upgrade packaging to 20.9
21.0 (2021-01-23)
=================
Deprecations and Removals
-------------------------
- Drop support for Python 2. (`#6148 <https://github.com/pypa/pip/issues/6148>`_)
- Remove support for legacy wheel cache entries that were created with pip
versions older than 20.0. (`#7502 <https://github.com/pypa/pip/issues/7502>`_)
- Remove support for VCS pseudo URLs editable requirements. It was emitting
deprecation warning since version 20.0. (`#7554 <https://github.com/pypa/pip/issues/7554>`_)
- Modernise the codebase after Python 2. (`#8802 <https://github.com/pypa/pip/issues/8802>`_)
- Drop support for Python 3.5. (`#9189 <https://github.com/pypa/pip/issues/9189>`_)
- Remove the VCS export feature that was used only with editable VCS
requirements and had correctness issues. (`#9338 <https://github.com/pypa/pip/issues/9338>`_)
Features
--------
- Add ``--ignore-requires-python`` support to pip download. (`#1884 <https://github.com/pypa/pip/issues/1884>`_)
- New resolver: Error message shown when a wheel contains inconsistent metadata
is made more helpful by including both values from the file name and internal
metadata. (`#9186 <https://github.com/pypa/pip/issues/9186>`_)
Bug Fixes
---------
- Fix a regression that made ``pip wheel`` do a VCS export instead of a VCS clone
for editable requirements. This broke VCS requirements that need the VCS
information to build correctly. (`#9273 <https://github.com/pypa/pip/issues/9273>`_)
- Fix ``pip download`` of editable VCS requirements that need VCS information
to build correctly. (`#9337 <https://github.com/pypa/pip/issues/9337>`_)
Vendored Libraries
------------------
- Upgrade msgpack to 1.0.2.
- Upgrade requests to 2.25.1.
Improved Documentation
----------------------
- Render the unreleased pip version change notes on the news page in docs. (`#9172 <https://github.com/pypa/pip/issues/9172>`_)
- Fix broken email link in docs feedback banners. (`#9343 <https://github.com/pypa/pip/issues/9343>`_)
20.3.4 (2021-01-23)
===================
Features
--------
- ``pip wheel`` now verifies the built wheel contains valid metadata, and can be
installed by a subsequent ``pip install``. This can be disabled with
``--no-verify``. (`#9206 <https://github.com/pypa/pip/issues/9206>`_)
- Improve presentation of XMLRPC errors in pip search. (`#9315 <https://github.com/pypa/pip/issues/9315>`_)
Bug Fixes
---------
- Fixed hanging VCS subprocess calls when the VCS outputs a large amount of data
on stderr. Restored logging of VCS errors that was inadvertently removed in pip
20.2. (`#8876 <https://github.com/pypa/pip/issues/8876>`_)
- Fix error when an existing incompatibility is unable to be applied to a backtracked state. (`#9180 <https://github.com/pypa/pip/issues/9180>`_)
- New resolver: Discard a faulty distribution, instead of quitting outright.
This implementation is taken from 20.2.2, with a fix that always makes the
resolver iterate through candidates from indexes lazily, to avoid downloading
candidates we do not need. (`#9203 <https://github.com/pypa/pip/issues/9203>`_)
- New resolver: Discard a source distribution if it fails to generate metadata,
instead of quitting outright. This implementation is taken from 20.2.2, with a
fix that always makes the resolver iterate through candidates from indexes
lazily, to avoid downloading candidates we do not need. (`#9246 <https://github.com/pypa/pip/issues/9246>`_)
Vendored Libraries
------------------
- Upgrade resolvelib to 0.5.4.
20.3.3 (2020-12-15)
===================
Bug Fixes
---------
- Revert "Skip candidate not providing valid metadata", as that caused pip to be overeager about downloading from the package index. (`#9264 <https://github.com/pypa/pip/issues/9264>`_)
20.3.2 (2020-12-15)
===================
Features
--------
- New resolver: Resolve direct and pinned (``==`` or ``===``) requirements first
to improve resolver performance. (`#9185 <https://github.com/pypa/pip/issues/9185>`_)
- Add a mechanism to delay resolving certain packages, and use it for setuptools. (`#9249 <https://github.com/pypa/pip/issues/9249>`_)
Bug Fixes
---------
- New resolver: The "Requirement already satisfied" log is not printed only once
for each package during resolution. (`#9117 <https://github.com/pypa/pip/issues/9117>`_)
- Fix crash when logic for redacting authentication information from URLs
in ``--help`` is given a list of strings, instead of a single string. (`#9191 <https://github.com/pypa/pip/issues/9191>`_)
- New resolver: Correctly implement PEP 592. Do not return yanked versions from
an index, unless the version range can only be satisfied by yanked candidates. (`#9203 <https://github.com/pypa/pip/issues/9203>`_)
- New resolver: Make constraints also apply to package variants with extras, so
the resolver correctly avoids backtracking on them. (`#9232 <https://github.com/pypa/pip/issues/9232>`_)
- New resolver: Discard a candidate if it fails to provide metadata from source,
or if the provided metadata is inconsistent, instead of quitting outright. (`#9246 <https://github.com/pypa/pip/issues/9246>`_)
Vendored Libraries
------------------
- Update vendoring to 20.8
Improved Documentation
----------------------
- Update documentation to reflect that pip still uses legacy resolver by default in Python 2 environments. (`#9269 <https://github.com/pypa/pip/issues/9269>`_)
20.3.1 (2020-12-03)
===================
Deprecations and Removals
-------------------------
- The --build-dir option has been restored as a no-op, to soften the transition
for tools that still used it. (`#9193 <https://github.com/pypa/pip/issues/9193>`_)
20.3 (2020-11-30)
=================
Deprecations and Removals
-------------------------
- Remove --unstable-feature flag as it has been deprecated. (`#9133 <https://github.com/pypa/pip/issues/9133>`_)
Features
--------
- Add support for :pep:`600`: Future 'manylinux' Platform Tags for Portable Linux Built Distributions. (`#9077 <https://github.com/pypa/pip/issues/9077>`_)
- The new resolver now resolves packages in a deterministic order. (`#9100 <https://github.com/pypa/pip/issues/9100>`_)
- Add support for MacOS Big Sur compatibility tags. (`#9138 <https://github.com/pypa/pip/issues/9138>`_)
Bug Fixes
---------
- New Resolver: Rework backtracking and state management, to avoid getting stuck in an infinite loop. (`#9011 <https://github.com/pypa/pip/issues/9011>`_)
- New resolver: Check version equality with ``packaging.version`` to avoid edge
cases if a wheel used different version normalization logic in its filename
and metadata. (`#9083 <https://github.com/pypa/pip/issues/9083>`_)
- New resolver: Show each requirement in the conflict error message only once to reduce cluttering. (`#9101 <https://github.com/pypa/pip/issues/9101>`_)
- Fix a regression that made ``pip wheel`` generate zip files of editable
requirements in the wheel directory. (`#9122 <https://github.com/pypa/pip/issues/9122>`_)
- Fix ResourceWarning in VCS subprocesses (`#9156 <https://github.com/pypa/pip/issues/9156>`_)
- Redact auth from URL in help message. (`#9160 <https://github.com/pypa/pip/issues/9160>`_)
- New Resolver: editable installations are done, regardless of whether
the already-installed distribution is editable. (`#9169 <https://github.com/pypa/pip/issues/9169>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2020.11.8
- Upgrade colorama to 0.4.4
- Upgrade packaging to 20.7
- Upgrade pep517 to 0.9.1
- Upgrade requests to 2.25.0
- Upgrade resolvelib to 0.5.3
- Upgrade toml to 0.10.2
- Upgrade urllib3 to 1.26.2
Improved Documentation
----------------------
- Add a section to the User Guide to cover backtracking during dependency resolution. (`#9039 <https://github.com/pypa/pip/issues/9039>`_)
- Reorder and revise installation instructions to make them easier to follow. (`#9131 <https://github.com/pypa/pip/issues/9131>`_)
20.3b1 (2020-10-31)
===================
Deprecations and Removals
-------------------------
- ``pip freeze`` will stop filtering the ``pip``, ``setuptools``, ``distribute`` and ``wheel`` packages from ``pip freeze`` output in a future version.
To keep the previous behavior, users should use the new ``--exclude`` option. (`#4256 <https://github.com/pypa/pip/issues/4256>`_)
- Deprecate support for Python 3.5 (`#8181 <https://github.com/pypa/pip/issues/8181>`_)
- Document that certain removals can be fast tracked. (`#8417 <https://github.com/pypa/pip/issues/8417>`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`#8927 <https://github.com/pypa/pip/issues/8927>`_)
- Deprecate ``--find-links`` option in ``pip freeze`` (`#9069 <https://github.com/pypa/pip/issues/9069>`_)
Features
--------
- Add ``--exclude`` option to ``pip freeze`` and ``pip list`` commands to explicitly exclude packages from the output. (`#4256 <https://github.com/pypa/pip/issues/4256>`_)
- Allow multiple values for --abi and --platform. (`#6121 <https://github.com/pypa/pip/issues/6121>`_)
- Add option ``--format`` to subcommand ``list`` of ``pip cache``, with ``abspath`` choice to output the full path of a wheel file. (`#8355 <https://github.com/pypa/pip/issues/8355>`_)
- Improve error message friendliness when an environment has packages with
corrupted metadata. (`#8676 <https://github.com/pypa/pip/issues/8676>`_)
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
situations where both fails are most probably irrelevant to this deprecation. (`#8752 <https://github.com/pypa/pip/issues/8752>`_)
- Check the download directory for existing wheels to possibly avoid
fetching metadata when the ``fast-deps`` feature is used with
``pip wheel`` and ``pip download``. (`#8804 <https://github.com/pypa/pip/issues/8804>`_)
- When installing a git URL that refers to a commit that is not available locally
after git clone, attempt to fetch it from the remote. (`#8815 <https://github.com/pypa/pip/issues/8815>`_)
- Include http subdirectory in ``pip cache info`` and ``pip cache purge`` commands. (`#8892 <https://github.com/pypa/pip/issues/8892>`_)
- Cache package listings on index packages so they are guaranteed to stay stable
during a pip command session. This also improves performance when a index page
is accessed multiple times during the command session. (`#8905 <https://github.com/pypa/pip/issues/8905>`_)
- New resolver: Tweak resolution logic to improve user experience when
user-supplied requirements conflict. (`#8924 <https://github.com/pypa/pip/issues/8924>`_)
- Support Python 3.9. (`#8971 <https://github.com/pypa/pip/issues/8971>`_)
- Log an informational message when backtracking takes multiple rounds on a specific package. (`#8975 <https://github.com/pypa/pip/issues/8975>`_)
- Switch to the new dependency resolver by default. (`#9019 <https://github.com/pypa/pip/issues/9019>`_)
- Remove the ``--build-dir`` option, as per the deprecation. (`#9049 <https://github.com/pypa/pip/issues/9049>`_)
Bug Fixes
---------
- Propagate ``--extra-index-url`` from requirements file properly to session auth,
so that keyring auth will work as expected. (`#8103 <https://github.com/pypa/pip/issues/8103>`_)
- Allow specifying verbosity and quiet level via configuration files
and environment variables. Previously these options were treated as
boolean values when read from there while through CLI the level can be
specified. (`#8578 <https://github.com/pypa/pip/issues/8578>`_)
- Only converts Windows path to unicode on Python 2 to avoid regressions when a
POSIX environment does not configure the file system encoding correctly. (`#8658 <https://github.com/pypa/pip/issues/8658>`_)
- List downloaded distributions before exiting ``pip download``
when using the new resolver to make the behavior the same as
that on the legacy resolver. (`#8696 <https://github.com/pypa/pip/issues/8696>`_)
- New resolver: Pick up hash declarations in constraints files and use them to
filter available distributions. (`#8792 <https://github.com/pypa/pip/issues/8792>`_)
- Avoid polluting the destination directory by resolution artifacts
when the new resolver is used for ``pip download`` or ``pip wheel``. (`#8827 <https://github.com/pypa/pip/issues/8827>`_)
- New resolver: If a package appears multiple times in user specification with
different ``--hash`` options, only hashes that present in all specifications
should be allowed. (`#8839 <https://github.com/pypa/pip/issues/8839>`_)
- Tweak the output during dependency resolution in the new resolver. (`#8861 <https://github.com/pypa/pip/issues/8861>`_)
- Correctly search for installed distributions in new resolver logic in order
to not miss packages (virtualenv packages from system-wide-packages for example) (`#8963 <https://github.com/pypa/pip/issues/8963>`_)
- Do not fail in pip freeze when encountering a ``direct_url.json`` metadata file
with editable=True. Render it as a non-editable ``file://`` URL until modern
editable installs are standardized and supported. (`#8996 <https://github.com/pypa/pip/issues/8996>`_)
Vendored Libraries
------------------
- Fix devendoring instructions to explicitly state that ``vendor.txt`` should not be removed.
It is mandatory for ``pip debug`` command.
Improved Documentation
----------------------
- Add documentation for '.netrc' support. (`#7231 <https://github.com/pypa/pip/issues/7231>`_)
- Add OS tabs for OS-specific commands. (`#7311 <https://github.com/pypa/pip/issues/7311>`_)
- Add note and example on keyring support for index basic-auth (`#8636 <https://github.com/pypa/pip/issues/8636>`_)
- Added initial UX feedback widgets to docs. (`#8783 <https://github.com/pypa/pip/issues/8783>`_, `#8848 <https://github.com/pypa/pip/issues/8848>`_)
- Add ux documentation (`#8807 <https://github.com/pypa/pip/issues/8807>`_)
- Update user docs to reflect new resolver as default in 20.3. (`#9044 <https://github.com/pypa/pip/issues/9044>`_)
- Improve migration guide to reflect changes in new resolver behavior. (`#9056 <https://github.com/pypa/pip/issues/9056>`_)
20.2.4 (2020-10-16)
===================
Deprecations and Removals
-------------------------
- Document that certain removals can be fast tracked. (`#8417 <https://github.com/pypa/pip/issues/8417>`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`#8927 <https://github.com/pypa/pip/issues/8927>`_)
Features
--------
- New resolver: Avoid accessing indexes when the installed candidate is preferred
and considered good enough. (`#8023 <https://github.com/pypa/pip/issues/8023>`_)
- Improve error message friendliness when an environment has packages with
corrupted metadata. (`#8676 <https://github.com/pypa/pip/issues/8676>`_)
- Cache package listings on index packages so they are guaranteed to stay stable
during a pip command session. This also improves performance when a index page
is accessed multiple times during the command session. (`#8905 <https://github.com/pypa/pip/issues/8905>`_)
- New resolver: Tweak resolution logic to improve user experience when
user-supplied requirements conflict. (`#8924 <https://github.com/pypa/pip/issues/8924>`_)
Bug Fixes
---------
- New resolver: Correctly respect ``Requires-Python`` metadata to reject
incompatible packages in ``--no-deps`` mode. (`#8758 <https://github.com/pypa/pip/issues/8758>`_)
- New resolver: Pick up hash declarations in constraints files and use them to
filter available distributions. (`#8792 <https://github.com/pypa/pip/issues/8792>`_)
- New resolver: If a package appears multiple times in user specification with
different ``--hash`` options, only hashes that present in all specifications
should be allowed. (`#8839 <https://github.com/pypa/pip/issues/8839>`_)
Improved Documentation
----------------------
- Add ux documentation (`#8807 <https://github.com/pypa/pip/issues/8807>`_)
20.2.3 (2020-09-08)
===================
Deprecations and Removals
-------------------------
- Deprecate support for Python 3.5 (`#8181 <https://github.com/pypa/pip/issues/8181>`_)
Features
--------
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
situations where both fails are most probably irrelevant to this deprecation. (`#8752 <https://github.com/pypa/pip/issues/8752>`_)
20.2.2 (2020-08-11)
===================
Bug Fixes
---------
- Only attempt to use the keyring once and if it fails, don't try again.
This prevents spamming users with several keyring unlock prompts when they
cannot unlock or don't want to do so. (`#8090 <https://github.com/pypa/pip/issues/8090>`_)
- Fix regression that distributions in system site-packages are not correctly
found when a virtual environment is configured with ``system-site-packages``
on. (`#8695 <https://github.com/pypa/pip/issues/8695>`_)
- Disable caching for range requests, which causes corrupted wheels
when pip tries to obtain metadata using the feature ``fast-deps``. (`#8701 <https://github.com/pypa/pip/issues/8701>`_, `#8716 <https://github.com/pypa/pip/issues/8716>`_)
- Always use UTF-8 to read ``pyvenv.cfg`` to match the built-in ``venv``. (`#8717 <https://github.com/pypa/pip/issues/8717>`_)
- 2020 Resolver: Correctly handle marker evaluation in constraints and exclude
them if their markers do not match the current environment. (`#8724 <https://github.com/pypa/pip/issues/8724>`_)
20.2.1 (2020-08-04)
===================
Features
--------
- Ignore require-virtualenv in ``pip list`` (`#8603 <https://github.com/pypa/pip/issues/8603>`_)
Bug Fixes
---------
- Correctly find already-installed distributions with dot (``.``) in the name
and uninstall them when needed. (`#8645 <https://github.com/pypa/pip/issues/8645>`_)
- Trace a better error message on installation failure due to invalid ``.data``
files in wheels. (`#8654 <https://github.com/pypa/pip/issues/8654>`_)
- Fix SVN version detection for alternative SVN distributions. (`#8665 <https://github.com/pypa/pip/issues/8665>`_)
- New resolver: Correctly include the base package when specified with extras
in ``--no-deps`` mode. (`#8677 <https://github.com/pypa/pip/issues/8677>`_)
- Use UTF-8 to handle ZIP archive entries on Python 2 according to PEP 427, so
non-ASCII paths can be resolved as expected. (`#8684 <https://github.com/pypa/pip/issues/8684>`_)
Improved Documentation
----------------------
- Add details on old resolver deprecation and removal to migration documentation. (`#8371 <https://github.com/pypa/pip/issues/8371>`_)
- Fix feature flag name in docs. (`#8660 <https://github.com/pypa/pip/issues/8660>`_)
20.2 (2020-07-29)
=================
Deprecations and Removals
-------------------------
- Deprecate setup.py-based builds that do not generate an ``.egg-info`` directory. (`#6998 <https://github.com/pypa/pip/issues/6998>`_, `#8617 <https://github.com/pypa/pip/issues/8617>`_)
- Disallow passing install-location-related arguments in ``--install-options``. (`#7309 <https://github.com/pypa/pip/issues/7309>`_)
- Add deprecation warning for invalid requirements format "base>=1.0[extra]" (`#8288 <https://github.com/pypa/pip/issues/8288>`_)
- Deprecate legacy setup.py install when building a wheel failed for source
distributions without pyproject.toml (`#8368 <https://github.com/pypa/pip/issues/8368>`_)
- Deprecate -b/--build/--build-dir/--build-directory. Its current behaviour is confusing
and breaks in case different versions of the same distribution need to be built during
the resolution process. Using the TMPDIR/TEMP/TMP environment variable, possibly
combined with --no-clean covers known use cases. (`#8372 <https://github.com/pypa/pip/issues/8372>`_)
- Remove undocumented and deprecated option ``--always-unzip`` (`#8408 <https://github.com/pypa/pip/issues/8408>`_)
Features
--------
- Log debugging information about pip, in ``pip install --verbose``. (`#3166 <https://github.com/pypa/pip/issues/3166>`_)
- Refine error messages to avoid showing Python tracebacks when an HTTP error occurs. (`#5380 <https://github.com/pypa/pip/issues/5380>`_)
- Install wheel files directly instead of extracting them to a temp directory. (`#6030 <https://github.com/pypa/pip/issues/6030>`_)
- Add a beta version of pip's next-generation dependency resolver.
Move pip's new resolver into beta, remove the
``--unstable-feature=resolver`` flag, and enable the
``--use-feature=2020-resolver`` flag. The new resolver is
significantly stricter and more consistent when it receives
incompatible instructions, and reduces support for certain kinds of
:ref:`Constraints Files`, so some workarounds and workflows may
break. More details about how to test and migrate, and how to report
issues, at :ref:`Resolver changes 2020` . Maintainers are preparing to
release pip 20.3, with the new resolver on by default, in October. (`#6536 <https://github.com/pypa/pip/issues/6536>`_)
- Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (`#8546 <https://github.com/pypa/pip/issues/8546>`_, `#8377 <https://github.com/pypa/pip/issues/8377>`_)
- Add a subcommand ``debug`` to ``pip config`` to list available configuration sources and the key-value pairs defined in them. (`#6741 <https://github.com/pypa/pip/issues/6741>`_)
- Warn if index pages have unexpected content-type (`#6754 <https://github.com/pypa/pip/issues/6754>`_)
- Allow specifying ``--prefer-binary`` option in a requirements file (`#7693 <https://github.com/pypa/pip/issues/7693>`_)
- Generate PEP 376 REQUESTED metadata for user supplied requirements installed
by pip. (`#7811 <https://github.com/pypa/pip/issues/7811>`_)
- Warn if package url is a vcs or an archive url with invalid scheme (`#8128 <https://github.com/pypa/pip/issues/8128>`_)
- Parallelize network operations in ``pip list``. (`#8504 <https://github.com/pypa/pip/issues/8504>`_)
- Allow the new resolver to obtain dependency information through wheels
lazily downloaded using HTTP range requests. To enable this feature,
invoke ``pip`` with ``--use-feature=fast-deps``. (`#8588 <https://github.com/pypa/pip/issues/8588>`_)
- Support ``--use-feature`` in requirements files (`#8601 <https://github.com/pypa/pip/issues/8601>`_)
Bug Fixes
---------
- Use canonical package names while looking up already installed packages. (`#5021 <https://github.com/pypa/pip/issues/5021>`_)
- Fix normalizing path on Windows when installing package on another logical disk. (`#7625 <https://github.com/pypa/pip/issues/7625>`_)
- The VCS commands run by pip as subprocesses don't merge stdout and stderr anymore, improving the output parsing by subsequent commands. (`#7968 <https://github.com/pypa/pip/issues/7968>`_)
- Correctly treat non-ASCII entry point declarations in wheels so they can be
installed on Windows. (`#8342 <https://github.com/pypa/pip/issues/8342>`_)
- Update author email in config and tests to reflect decommissioning of pypa-dev list. (`#8454 <https://github.com/pypa/pip/issues/8454>`_)
- Headers provided by wheels in .data directories are now correctly installed
into the user-provided locations, such as ``--prefix``, instead of the virtual
environment pip is running in. (`#8521 <https://github.com/pypa/pip/issues/8521>`_)
Vendored Libraries
------------------
- Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.
- Upgrade appdirs to 1.4.4
- Upgrade certifi to 2020.6.20
- Upgrade distlib to 0.3.1
- Upgrade html5lib to 1.1
- Upgrade idna to 2.10
- Upgrade packaging to 20.4
- Upgrade requests to 2.24.0
- Upgrade six to 1.15.0
- Upgrade toml to 0.10.1
- Upgrade urllib3 to 1.25.9
Improved Documentation
----------------------
- Add ``--no-input`` option to pip docs (`#7688 <https://github.com/pypa/pip/issues/7688>`_)
- List of options supported in requirements file are extracted from source of truth,
instead of being maintained manually. (`#7908 <https://github.com/pypa/pip/issues/7908>`_)
- Fix pip config docstring so that the subcommands render correctly in the docs (`#8072 <https://github.com/pypa/pip/issues/8072>`_)
- replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`#8353 <https://github.com/pypa/pip/issues/8353>`_)
- Fix example for defining multiple values for options which support them (`#8373 <https://github.com/pypa/pip/issues/8373>`_)
- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`#8459 <https://github.com/pypa/pip/issues/8459>`_)
- Add feature flags to docs (`#8512 <https://github.com/pypa/pip/issues/8512>`_)
- Document how to install package extras from git branch and source distributions. (`#8576 <https://github.com/pypa/pip/issues/8576>`_)
20.2b1 (2020-05-21)
===================
Bug Fixes
---------
- Correctly treat wheels containing non-ASCII file contents so they can be
installed on Windows. (`#5712 <https://github.com/pypa/pip/issues/5712>`_)
- Prompt the user for password if the keyring backend doesn't return one (`#7998 <https://github.com/pypa/pip/issues/7998>`_)
Improved Documentation
----------------------
- Add GitHub issue template for reporting when the dependency resolver fails (`#8207 <https://github.com/pypa/pip/issues/8207>`_)
20.1.1 (2020-05-19)
===================
Deprecations and Removals
-------------------------
- Revert building of local directories in place, restoring the pre-20.1
behaviour of copying to a temporary directory. (`#7555 <https://github.com/pypa/pip/issues/7555>`_)
- Drop parallelization from ``pip list --outdated``. (`#8167 <https://github.com/pypa/pip/issues/8167>`_)
Bug Fixes
---------
- Fix metadata permission issues when umask has the executable bit set. (`#8164 <https://github.com/pypa/pip/issues/8164>`_)
- Avoid unnecessary message about the wheel package not being installed
when a wheel would not have been built. Additionally, clarify the message. (`#8178 <https://github.com/pypa/pip/issues/8178>`_)
20.1 (2020-04-28)
=================
Process
-------
- Document that pip 21.0 will drop support for Python 2.7.
Features
--------
- Add ``pip cache dir`` to show the cache directory. (`#7350 <https://github.com/pypa/pip/issues/7350>`_)
Bug Fixes
---------
- Abort pip cache commands early when cache is disabled. (`#8124 <https://github.com/pypa/pip/issues/8124>`_)
- Correctly set permissions on metadata files during wheel installation,
to permit non-privileged users to read from system site-packages. (`#8139 <https://github.com/pypa/pip/issues/8139>`_)
20.1b1 (2020-04-21)
===================
Deprecations and Removals
-------------------------
- Remove emails from AUTHORS.txt to prevent usage for spamming, and only populate names in AUTHORS.txt at time of release (`#5979 <https://github.com/pypa/pip/issues/5979>`_)
- Remove deprecated ``--skip-requirements-regex`` option. (`#7297 <https://github.com/pypa/pip/issues/7297>`_)
- Building of local directories is now done in place, instead of a temporary
location containing a copy of the directory tree. (`#7555 <https://github.com/pypa/pip/issues/7555>`_)
- Remove unused ``tests/scripts/test_all_pip.py`` test script and the ``tests/scripts`` folder. (`#7680 <https://github.com/pypa/pip/issues/7680>`_)
Features
--------
- pip now implements PEP 610, so ``pip freeze`` has better fidelity
in presence of distributions installed from Direct URL requirements. (`#609 <https://github.com/pypa/pip/issues/609>`_)
- Add ``pip cache`` command for inspecting/managing pip's wheel cache. (`#6391 <https://github.com/pypa/pip/issues/6391>`_)
- Raise error if ``--user`` and ``--target`` are used together in ``pip install`` (`#7249 <https://github.com/pypa/pip/issues/7249>`_)
- Significantly improve performance when ``--find-links`` points to a very large HTML page. (`#7729 <https://github.com/pypa/pip/issues/7729>`_)
- Indicate when wheel building is skipped, due to lack of the ``wheel`` package. (`#7768 <https://github.com/pypa/pip/issues/7768>`_)
- Change default behaviour to always cache responses from trusted-host source. (`#7847 <https://github.com/pypa/pip/issues/7847>`_)
- An alpha version of a new resolver is available via ``--unstable-feature=resolver``. (`#988 <https://github.com/pypa/pip/issues/988>`_)
Bug Fixes
---------
- Correctly freeze a VCS editable package when it is nested inside another VCS repository. (`#3988 <https://github.com/pypa/pip/issues/3988>`_)
- Correctly handle ``%2F`` in URL parameters to avoid accidentally unescape them
into ``/``. (`#6446 <https://github.com/pypa/pip/issues/6446>`_)
- Reject VCS URLs with an empty revision. (`#7402 <https://github.com/pypa/pip/issues/7402>`_)
- Warn when an invalid URL is passed with ``--index-url`` (`#7430 <https://github.com/pypa/pip/issues/7430>`_)
- Use better mechanism for handling temporary files, when recording metadata
about installed files (RECORD) and the installer (INSTALLER). (`#7699 <https://github.com/pypa/pip/issues/7699>`_)
- Correctly detect global site-packages availability of virtual environments
created by PyPA’s virtualenv>=20.0. (`#7718 <https://github.com/pypa/pip/issues/7718>`_)
- Remove current directory from ``sys.path`` when invoked as ``python -m pip <command>`` (`#7731 <https://github.com/pypa/pip/issues/7731>`_)
- Stop failing uninstallation, when trying to remove non-existent files. (`#7856 <https://github.com/pypa/pip/issues/7856>`_)
- Prevent an infinite recursion with ``pip wheel`` when ``$TMPDIR`` is within the source directory. (`#7872 <https://github.com/pypa/pip/issues/7872>`_)
- Significantly speedup ``pip list --outdated`` by parallelizing index interaction. (`#7962 <https://github.com/pypa/pip/issues/7962>`_)
- Improve Windows compatibility when detecting writability in folder. (`#8013 <https://github.com/pypa/pip/issues/8013>`_)
Vendored Libraries
------------------
- Update semi-supported debundling script to reflect that appdirs is vendored.
- Add ResolveLib as a vendored dependency.
- Upgrade certifi to 2020.04.05.1
- Upgrade contextlib2 to 0.6.0.post1
- Upgrade distro to 1.5.0.
- Upgrade idna to 2.9.
- Upgrade msgpack to 1.0.0.
- Upgrade packaging to 20.3.
- Upgrade pep517 to 0.8.2.
- Upgrade pyparsing to 2.4.7.
- Remove pytoml as a vendored dependency.
- Upgrade requests to 2.23.0.
- Add toml as a vendored dependency.
- Upgrade urllib3 to 1.25.8.
Improved Documentation
----------------------
- Emphasize that VCS URLs using git, git+git and git+http are insecure due to
lack of authentication and encryption (`#1983 <https://github.com/pypa/pip/issues/1983>`_)
- Clarify the usage of --no-binary command. (`#3191 <https://github.com/pypa/pip/issues/3191>`_)
- Clarify the usage of freeze command in the example of Using pip in your program (`#7008 <https://github.com/pypa/pip/issues/7008>`_)
- Add a "Copyright" page. (`#7767 <https://github.com/pypa/pip/issues/7767>`_)
- Added example of defining multiple values for options which support them (`#7803 <https://github.com/pypa/pip/issues/7803>`_)
20.0.2 (2020-01-24)
===================
Bug Fixes
---------
- Fix a regression in generation of compatibility tags. (`#7626 <https://github.com/pypa/pip/issues/7626>`_)
Vendored Libraries
------------------
- Upgrade packaging to 20.1
20.0.1 (2020-01-21)
===================
Bug Fixes
---------
- Rename an internal module, to avoid ImportErrors due to improper uninstallation. (`#7621 <https://github.com/pypa/pip/issues/7621>`_)
20.0 (2020-01-21)
=================
Process
-------
- Switch to a dedicated CLI tool for vendoring dependencies.
Deprecations and Removals
-------------------------
- Remove wheel tag calculation from pip and use ``packaging.tags``. This
should provide more tags ordered better than in prior releases. (`#6908 <https://github.com/pypa/pip/issues/6908>`_)
- Deprecate setup.py-based builds that do not generate an ``.egg-info`` directory. (`#6998 <https://github.com/pypa/pip/issues/6998>`_)
- The pip>=20 wheel cache is not retro-compatible with previous versions. Until
pip 21.0, pip will continue to take advantage of existing legacy cache
entries. (`#7296 <https://github.com/pypa/pip/issues/7296>`_)
- Deprecate undocumented ``--skip-requirements-regex`` option. (`#7297 <https://github.com/pypa/pip/issues/7297>`_)
- Deprecate passing install-location-related options via ``--install-option``. (`#7309 <https://github.com/pypa/pip/issues/7309>`_)
- Use literal "abi3" for wheel tag on CPython 3.x, to align with PEP 384
which only defines it for this platform. (`#7327 <https://github.com/pypa/pip/issues/7327>`_)
- Remove interpreter-specific major version tag e.g. ``cp3-none-any``
from consideration. This behavior was not documented strictly, and this
tag in particular is `not useful <https://snarky.ca/the-challenges-in-designing-a-library-for-pep-425/>`_.
Anyone with a use case can create an issue with pypa/packaging. (`#7355 <https://github.com/pypa/pip/issues/7355>`_)
- Wheel processing no longer permits wheels containing more than one top-level
.dist-info directory. (`#7487 <https://github.com/pypa/pip/issues/7487>`_)
- Support for the ``git+git@`` form of VCS requirement is being deprecated and
will be removed in pip 21.0. Switch to ``git+https://`` or
``git+ssh://``. ``git+git://`` also works but its use is discouraged as it is
insecure. (`#7543 <https://github.com/pypa/pip/issues/7543>`_)
Features
--------
- Default to doing a user install (as if ``--user`` was passed) when the main
site-packages directory is not writeable and user site-packages are enabled. (`#1668 <https://github.com/pypa/pip/issues/1668>`_)
- Warn if a path in PATH starts with tilde during ``pip install``. (`#6414 <https://github.com/pypa/pip/issues/6414>`_)
- Cache wheels built from Git requirements that are considered immutable,
because they point to a commit hash. (`#6640 <https://github.com/pypa/pip/issues/6640>`_)
- Add option ``--no-python-version-warning`` to silence warnings
related to deprecation of Python versions. (`#6673 <https://github.com/pypa/pip/issues/6673>`_)
- Cache wheels that ``pip wheel`` built locally, matching what
``pip install`` does. This particularly helps performance in workflows where
``pip wheel`` is used for `building before installing
<https://pip.pypa.io/en/stable/user_guide/#installing-from-local-packages>`_.
Users desiring the original behavior can use ``pip wheel --no-cache-dir``. (`#6852 <https://github.com/pypa/pip/issues/6852>`_)
- Display CA information in ``pip debug``. (`#7146 <https://github.com/pypa/pip/issues/7146>`_)
- Show only the filename (instead of full URL), when downloading from PyPI. (`#7225 <https://github.com/pypa/pip/issues/7225>`_)
- Suggest a more robust command to upgrade pip itself to avoid confusion when the
current pip command is not available as ``pip``. (`#7376 <https://github.com/pypa/pip/issues/7376>`_)
- Define all old pip console script entrypoints to prevent import issues in
stale wrapper scripts. (`#7498 <https://github.com/pypa/pip/issues/7498>`_)
- The build step of ``pip wheel`` now builds all wheels to a cache first,
then copies them to the wheel directory all at once.
Before, it built them to a temporary directory and moved
them to the wheel directory one by one. (`#7517 <https://github.com/pypa/pip/issues/7517>`_)
- Expand ``~`` prefix to user directory in path options, configs, and
environment variables. Values that may be either URL or path are not
currently supported, to avoid ambiguity:
* ``--find-links``
* ``--constraint``, ``-c``
* ``--requirement``, ``-r``
* ``--editable``, ``-e`` (`#980 <https://github.com/pypa/pip/issues/980>`_)
Bug Fixes
---------
- Correctly handle system site-packages, in virtual environments created with venv (PEP 405). (`#5702 <https://github.com/pypa/pip/issues/5702>`_, `#7155 <https://github.com/pypa/pip/issues/7155>`_)
- Fix case sensitive comparison of pip freeze when used with -r option. (`#5716 <https://github.com/pypa/pip/issues/5716>`_)
- Enforce PEP 508 requirement format in ``pyproject.toml``
``build-system.requires``. (`#6410 <https://github.com/pypa/pip/issues/6410>`_)
- Make ``ensure_dir()`` also ignore ``ENOTEMPTY`` as seen on Windows. (`#6426 <https://github.com/pypa/pip/issues/6426>`_)
- Fix building packages which specify ``backend-path`` in pyproject.toml. (`#6599 <https://github.com/pypa/pip/issues/6599>`_)
- Do not attempt to run ``setup.py clean`` after a ``pep517`` build error,
since a ``setup.py`` may not exist in that case. (`#6642 <https://github.com/pypa/pip/issues/6642>`_)
- Fix passwords being visible in the index-url in
"Downloading <url>" message. (`#6783 <https://github.com/pypa/pip/issues/6783>`_)
- Change method from shutil.remove to shutil.rmtree in noxfile.py. (`#7191 <https://github.com/pypa/pip/issues/7191>`_)
- Skip running tests which require subversion, when svn isn't installed (`#7193 <https://github.com/pypa/pip/issues/7193>`_)
- Fix not sending client certificates when using ``--trusted-host``. (`#7207 <https://github.com/pypa/pip/issues/7207>`_)
- Make sure ``pip wheel`` never outputs pure python wheels with a
python implementation tag. Better fix/workaround for
`#3025 <https://github.com/pypa/pip/issues/3025>`_ by
using a per-implementation wheel cache instead of caching pure python
wheels with an implementation tag in their name. (`#7296 <https://github.com/pypa/pip/issues/7296>`_)
- Include ``subdirectory`` URL fragments in cache keys. (`#7333 <https://github.com/pypa/pip/issues/7333>`_)
- Fix typo in warning message when any of ``--build-option``, ``--global-option``
and ``--install-option`` is used in requirements.txt (`#7340 <https://github.com/pypa/pip/issues/7340>`_)
- Fix the logging of cached HTTP response shown as downloading. (`#7393 <https://github.com/pypa/pip/issues/7393>`_)
- Effectively disable the wheel cache when it is not writable, as is the
case with the http cache. (`#7488 <https://github.com/pypa/pip/issues/7488>`_)
- Correctly handle relative cache directory provided via --cache-dir. (`#7541 <https://github.com/pypa/pip/issues/7541>`_)
Vendored Libraries
------------------
- Upgrade CacheControl to 0.12.5
- Upgrade certifi to 2019.9.11
- Upgrade colorama to 0.4.1
- Upgrade distlib to 0.2.9.post0
- Upgrade ipaddress to 1.0.22
- Update packaging to 20.0.
- Upgrade pkg_resources (via setuptools) to 44.0.0
- Upgrade pyparsing to 2.4.2
- Upgrade six to 1.12.0
- Upgrade urllib3 to 1.25.6
Improved Documentation
----------------------
- Document that "coding: utf-8" is supported in requirements.txt (`#7182 <https://github.com/pypa/pip/issues/7182>`_)
- Explain how to get pip's source code in `Getting Started <https://pip.pypa.io/en/stable/development/getting-started/>`_ (`#7197 <https://github.com/pypa/pip/issues/7197>`_)
- Describe how basic authentication credentials in URLs work. (`#7201 <https://github.com/pypa/pip/issues/7201>`_)
- Add more clear installation instructions (`#7222 <https://github.com/pypa/pip/issues/7222>`_)
- Fix documentation links for index options (`#7347 <https://github.com/pypa/pip/issues/7347>`_)
- Better document the requirements file format (`#7385 <https://github.com/pypa/pip/issues/7385>`_)
19.3.1 (2019-10-17)
===================
Features
--------
- Document Python 3.8 support. (`#7219 <https://github.com/pypa/pip/issues/7219>`_)
Bug Fixes
---------
- Fix bug that prevented installation of PEP 517 packages without ``setup.py``. (`#6606 <https://github.com/pypa/pip/issues/6606>`_)
19.3 (2019-10-14)
=================
Deprecations and Removals
-------------------------
- Remove undocumented support for un-prefixed URL requirements pointing
to SVN repositories. Users relying on this can get the original behavior
by prefixing their URL with ``svn+`` (which is backwards-compatible). (`#7037 <https://github.com/pypa/pip/issues/7037>`_)
- Remove the deprecated ``--venv`` option from ``pip config``. (`#7163 <https://github.com/pypa/pip/issues/7163>`_)
Features
--------
- Print a better error message when ``--no-binary`` or ``--only-binary`` is given
an argument starting with ``-``. (`#3191 <https://github.com/pypa/pip/issues/3191>`_)
- Make ``pip show`` warn about packages not found. (`#6858 <https://github.com/pypa/pip/issues/6858>`_)
- Support including a port number in ``--trusted-host`` for both HTTP and HTTPS. (`#6886 <https://github.com/pypa/pip/issues/6886>`_)
- Redact single-part login credentials from URLs in log messages. (`#6891 <https://github.com/pypa/pip/issues/6891>`_)
- Implement manylinux2014 platform tag support. manylinux2014 is the successor
to manylinux2010. It allows carefully compiled binary wheels to be installed
on compatible Linux platforms. The manylinux2014 platform tag definition can
be found in `PEP599 <https://www.python.org/dev/peps/pep-0599/>`_. (`#7102 <https://github.com/pypa/pip/issues/7102>`_)
Bug Fixes
---------
- Abort installation if any archive contains a file which would be placed
outside the extraction location. (`#3907 <https://github.com/pypa/pip/issues/3907>`_)
- pip's CLI completion code no longer prints a Traceback if it is interrupted. (`#3942 <https://github.com/pypa/pip/issues/3942>`_)
- Correct inconsistency related to the ``hg+file`` scheme. (`#4358 <https://github.com/pypa/pip/issues/4358>`_)
- Fix ``rmtree_errorhandler`` to skip non-existing directories. (`#4910 <https://github.com/pypa/pip/issues/4910>`_)
- Ignore errors copying socket files for local source installs (in Python 3). (`#5306 <https://github.com/pypa/pip/issues/5306>`_)
- Fix requirement line parser to correctly handle PEP 440 requirements with a URL
pointing to an archive file. (`#6202 <https://github.com/pypa/pip/issues/6202>`_)
- The ``pip-wheel-metadata`` directory does not need to persist between invocations of pip, use a temporary directory instead of the current ``setup.py`` directory. (`#6213 <https://github.com/pypa/pip/issues/6213>`_)
- Fix ``--trusted-host`` processing under HTTPS to trust any port number used
with the host. (`#6705 <https://github.com/pypa/pip/issues/6705>`_)
- Switch to new ``distlib`` wheel script template. This should be functionally
equivalent for end users. (`#6763 <https://github.com/pypa/pip/issues/6763>`_)
- Skip copying .tox and .nox directories to temporary build directories (`#6770 <https://github.com/pypa/pip/issues/6770>`_)
- Fix handling of tokens (single part credentials) in URLs. (`#6795 <https://github.com/pypa/pip/issues/6795>`_)
- Fix a regression that caused ``~`` expansion not to occur in ``--find-links``
paths. (`#6804 <https://github.com/pypa/pip/issues/6804>`_)
- Fix bypassed pip upgrade warning on Windows. (`#6841 <https://github.com/pypa/pip/issues/6841>`_)
- Fix 'm' flag erroneously being appended to ABI tag in Python 3.8 on platforms that do not provide SOABI (`#6885 <https://github.com/pypa/pip/issues/6885>`_)
- Hide security-sensitive strings like passwords in log messages related to
version control system (aka VCS) command invocations. (`#6890 <https://github.com/pypa/pip/issues/6890>`_)
- Correctly uninstall symlinks that were installed in a virtualenv,
by tools such as ``flit install --symlink``. (`#6892 <https://github.com/pypa/pip/issues/6892>`_)
- Don't fail installation using pip.exe on Windows when pip wouldn't be upgraded. (`#6924 <https://github.com/pypa/pip/issues/6924>`_)
- Use canonical distribution names when computing ``Required-By`` in ``pip show``. (`#6947 <https://github.com/pypa/pip/issues/6947>`_)
- Don't use hardlinks for locking selfcheck state file. (`#6954 <https://github.com/pypa/pip/issues/6954>`_)
- Ignore "require_virtualenv" in ``pip config`` (`#6991 <https://github.com/pypa/pip/issues/6991>`_)
- Fix ``pip freeze`` not showing correct entry for mercurial packages that use subdirectories. (`#7071 <https://github.com/pypa/pip/issues/7071>`_)
- Fix a crash when ``sys.stdin`` is set to ``None``, such as on AWS Lambda. (`#7118 <https://github.com/pypa/pip/issues/7118>`_, `#7119 <https://github.com/pypa/pip/issues/7119>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2019.9.11
- Add contextlib2 0.6.0 as a vendored dependency.
- Remove Lockfile as a vendored dependency.
- Upgrade msgpack to 0.6.2
- Upgrade packaging to 19.2
- Upgrade pep517 to 0.7.0
- Upgrade pyparsing to 2.4.2
- Upgrade pytoml to 0.1.21
- Upgrade setuptools to 41.4.0
- Upgrade urllib3 to 1.25.6
Improved Documentation
----------------------
- Document caveats for UNC paths in uninstall and add .pth unit tests. (`#6516 <https://github.com/pypa/pip/issues/6516>`_)
- Add architectural overview documentation. (`#6637 <https://github.com/pypa/pip/issues/6637>`_)
- Document that ``--ignore-installed`` is dangerous. (`#6794 <https://github.com/pypa/pip/issues/6794>`_)
19.2.3 (2019-08-25)
===================
Bug Fixes
---------
- Fix 'm' flag erroneously being appended to ABI tag in Python 3.8 on platforms that do not provide SOABI (`#6885 <https://github.com/pypa/pip/issues/6885>`_)
19.2.2 (2019-08-11)
===================
Bug Fixes
---------
- Fix handling of tokens (single part credentials) in URLs. (`#6795 <https://github.com/pypa/pip/issues/6795>`_)
- Fix a regression that caused ``~`` expansion not to occur in ``--find-links``
paths. (`#6804 <https://github.com/pypa/pip/issues/6804>`_)
19.2.1 (2019-07-23)
===================
Bug Fixes
---------
- Fix a ``NoneType`` ``AttributeError`` when evaluating hashes and no hashes
are provided. (`#6772 <https://github.com/pypa/pip/issues/6772>`_)
19.2 (2019-07-22)
=================
Deprecations and Removals
-------------------------
- Drop support for EOL Python 3.4. (`#6685 <https://github.com/pypa/pip/issues/6685>`_)
- Improve deprecation messages to include the version in which the functionality will be removed. (`#6549 <https://github.com/pypa/pip/issues/6549>`_)
Features
--------
- Credentials will now be loaded using `keyring` when installed. (`#5948 <https://github.com/pypa/pip/issues/5948>`_)
- Fully support using ``--trusted-host`` inside requirements files. (`#3799 <https://github.com/pypa/pip/issues/3799>`_)
- Update timestamps in pip's ``--log`` file to include milliseconds. (`#6587 <https://github.com/pypa/pip/issues/6587>`_)
- Respect whether a file has been marked as "yanked" from a simple repository
(see `PEP 592 <https://www.python.org/dev/peps/pep-0592/>`__ for details). (`#6633 <https://github.com/pypa/pip/issues/6633>`_)
- When choosing candidates to install, prefer candidates with a hash matching
one of the user-provided hashes. (`#5874 <https://github.com/pypa/pip/issues/5874>`_)
- Improve the error message when ``METADATA`` or ``PKG-INFO`` is None when
accessing metadata. (`#5082 <https://github.com/pypa/pip/issues/5082>`_)
- Add a new command ``pip debug`` that can display e.g. the list of compatible
tags for the current Python. (`#6638 <https://github.com/pypa/pip/issues/6638>`_)
- Display hint on installing with --pre when search results include pre-release versions. (`#5169 <https://github.com/pypa/pip/issues/5169>`_)
- Report to Warehouse that pip is running under CI if the ``PIP_IS_CI`` environment variable is set. (`#5499 <https://github.com/pypa/pip/issues/5499>`_)
- Allow ``--python-version`` to be passed as a dotted version string (e.g.
``3.7`` or ``3.7.3``). (`#6585 <https://github.com/pypa/pip/issues/6585>`_)
- Log the final filename and SHA256 of a ``.whl`` file when done building a
wheel. (`#5908 <https://github.com/pypa/pip/issues/5908>`_)
- Include the wheel's tags in the log message explanation when a candidate
wheel link is found incompatible. (`#6121 <https://github.com/pypa/pip/issues/6121>`_)
- Add a ``--path`` argument to ``pip freeze`` to support ``--target``
installations. (`#6404 <https://github.com/pypa/pip/issues/6404>`_)
- Add a ``--path`` argument to ``pip list`` to support ``--target``
installations. (`#6551 <https://github.com/pypa/pip/issues/6551>`_)
Bug Fixes
---------
- Set ``sys.argv[0]`` to the underlying ``setup.py`` when invoking ``setup.py``
via the setuptools shim so setuptools doesn't think the path is ``-c``. (`#1890 <https://github.com/pypa/pip/issues/1890>`_)
- Update ``pip download`` to respect the given ``--python-version`` when checking
``"Requires-Python"``. (`#5369 <https://github.com/pypa/pip/issues/5369>`_)
- Respect ``--global-option`` and ``--install-option`` when installing from
a version control url (e.g. ``git``). (`#5518 <https://github.com/pypa/pip/issues/5518>`_)
- Make the "ascii" progress bar really be "ascii" and not Unicode. (`#5671 <https://github.com/pypa/pip/issues/5671>`_)
- Fail elegantly when trying to set an incorrectly formatted key in config. (`#5963 <https://github.com/pypa/pip/issues/5963>`_)
- Prevent DistutilsOptionError when prefix is indicated in the global environment and `--target` is used. (`#6008 <https://github.com/pypa/pip/issues/6008>`_)
- Fix ``pip install`` to respect ``--ignore-requires-python`` when evaluating
links. (`#6371 <https://github.com/pypa/pip/issues/6371>`_)
- Fix a debug log message when freezing an editable, non-version controlled
requirement. (`#6383 <https://github.com/pypa/pip/issues/6383>`_)
- Extend to Subversion 1.8+ the behavior of calling Subversion in
interactive mode when pip is run interactively. (`#6386 <https://github.com/pypa/pip/issues/6386>`_)
- Prevent ``pip install <url>`` from permitting directory traversal if e.g.
a malicious server sends a ``Content-Disposition`` header with a filename
containing ``../`` or ``..\\``. (`#6413 <https://github.com/pypa/pip/issues/6413>`_)
- Hide passwords in output when using ``--find-links``. (`#6489 <https://github.com/pypa/pip/issues/6489>`_)
- Include more details in the log message if ``pip freeze`` can't generate a
requirement string for a particular distribution. (`#6513 <https://github.com/pypa/pip/issues/6513>`_)
- Add the line number and file location to the error message when reading an
invalid requirements file in certain situations. (`#6527 <https://github.com/pypa/pip/issues/6527>`_)
- Prefer ``os.confstr`` to ``ctypes`` when extracting glibc version info. (`#6543 <https://github.com/pypa/pip/issues/6543>`_, `#6675 <https://github.com/pypa/pip/issues/6675>`_)
- Improve error message printed when an invalid editable requirement is provided. (`#6648 <https://github.com/pypa/pip/issues/6648>`_)
- Improve error message formatting when a command errors out in a subprocess. (`#6651 <https://github.com/pypa/pip/issues/6651>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2019.6.16
- Upgrade distlib to 0.2.9.post0
- Upgrade msgpack to 0.6.1
- Upgrade requests to 2.22.0
- Upgrade urllib3 to 1.25.3
- Patch vendored html5lib, to prefer using `collections.abc` where possible.
Improved Documentation
----------------------
- Document how Python 2.7 support will be maintained. (`#6726 <https://github.com/pypa/pip/issues/6726>`_)
- Upgrade Sphinx version used to build documentation. (`#6471 <https://github.com/pypa/pip/issues/6471>`_)
- Fix generation of subcommand manpages. (`#6724 <https://github.com/pypa/pip/issues/6724>`_)
- Mention that pip can install from git refs. (`#6512 <https://github.com/pypa/pip/issues/6512>`_)
- Replace a failing example of pip installs with extras with a working one. (`#4733 <https://github.com/pypa/pip/issues/4733>`_)
19.1.1 (2019-05-06)
===================
Features
--------
- Restore ``pyproject.toml`` handling to how it was with pip 19.0.3 to prevent
the need to add ``--no-use-pep517`` when installing in editable mode. (`#6434 <https://github.com/pypa/pip/issues/6434>`_)
Bug Fixes
---------
- Fix a regression that caused `@` to be quoted in pypiserver links.
This interfered with parsing the revision string from VCS urls. (`#6440 <https://github.com/pypa/pip/issues/6440>`_)
19.1 (2019-04-23)
=================
Features
--------
- Configuration files may now also be stored under ``sys.prefix`` (`#5060 <https://github.com/pypa/pip/issues/5060>`_)
- Avoid creating an unnecessary local clone of a Bazaar branch when exporting. (`#5443 <https://github.com/pypa/pip/issues/5443>`_)
- Include in pip's User-Agent string whether it looks like pip is running
under CI. (`#5499 <https://github.com/pypa/pip/issues/5499>`_)
- A custom (JSON-encoded) string can now be added to pip's User-Agent
using the ``PIP_USER_AGENT_USER_DATA`` environment variable. (`#5549 <https://github.com/pypa/pip/issues/5549>`_)
- For consistency, passing ``--no-cache-dir`` no longer affects whether wheels
will be built. In this case, a temporary directory is used. (`#5749 <https://github.com/pypa/pip/issues/5749>`_)
- Command arguments in ``subprocess`` log messages are now quoted using
``shlex.quote()``. (`#6290 <https://github.com/pypa/pip/issues/6290>`_)
- Prefix warning and error messages in log output with `WARNING` and `ERROR`. (`#6298 <https://github.com/pypa/pip/issues/6298>`_)
- Using ``--build-options`` in a PEP 517 build now fails with an error,
rather than silently ignoring the option. (`#6305 <https://github.com/pypa/pip/issues/6305>`_)
- Error out with an informative message if one tries to install a
``pyproject.toml``-style (PEP 517) source tree using ``--editable`` mode. (`#6314 <https://github.com/pypa/pip/issues/6314>`_)
- When downloading a package, the ETA and average speed now only update once per second for better legibility. (`#6319 <https://github.com/pypa/pip/issues/6319>`_)
Bug Fixes
---------
- The stdout and stderr from VCS commands run by pip as subprocesses (e.g.
``git``, ``hg``, etc.) no longer pollute pip's stdout. (`#1219 <https://github.com/pypa/pip/issues/1219>`_)
- Fix handling of requests exceptions when dependencies are debundled. (`#4195 <https://github.com/pypa/pip/issues/4195>`_)
- Make pip's self version check avoid recommending upgrades to prereleases if the currently-installed version is stable. (`#5175 <https://github.com/pypa/pip/issues/5175>`_)
- Fixed crash when installing a requirement from a URL that comes from a dependency without a URL. (`#5889 <https://github.com/pypa/pip/issues/5889>`_)
- Improve handling of file URIs: correctly handle `file://localhost/...` and don't try to use UNC paths on Unix. (`#5892 <https://github.com/pypa/pip/issues/5892>`_)
- Fix ``utils.encoding.auto_decode()`` ``LookupError`` with invalid encodings.
``utils.encoding.auto_decode()`` was broken when decoding Big Endian BOM
byte-strings on Little Endian or vice versa. (`#6054 <https://github.com/pypa/pip/issues/6054>`_)
- Fix incorrect URL quoting of IPv6 addresses. (`#6285 <https://github.com/pypa/pip/issues/6285>`_)
- Redact the password from the extra index URL when using ``pip -v``. (`#6295 <https://github.com/pypa/pip/issues/6295>`_)
- The spinner no longer displays a completion message after subprocess calls
not needing a spinner. It also no longer incorrectly reports an error after
certain subprocess calls to Git that succeeded. (`#6312 <https://github.com/pypa/pip/issues/6312>`_)
- Fix the handling of editable mode during installs when ``pyproject.toml`` is
present but PEP 517 doesn't require the source tree to be treated as
``pyproject.toml``-style. (`#6370 <https://github.com/pypa/pip/issues/6370>`_)
- Fix ``NameError`` when handling an invalid requirement. (`#6419 <https://github.com/pypa/pip/issues/6419>`_)
Vendored Libraries
------------------
- Updated certifi to 2019.3.9
- Updated distro to 1.4.0
- Update progress to 1.5
- Updated pyparsing to 2.4.0
- Updated pkg_resources to 41.0.1 (via setuptools)
Improved Documentation
----------------------
- Make dashes render correctly when displaying long options like
``--find-links`` in the text. (`#6422 <https://github.com/pypa/pip/issues/6422>`_)
19.0.3 (2019-02-20)
===================
Bug Fixes
---------
- Fix an ``IndexError`` crash when a legacy build of a wheel fails. (`#6252 <https://github.com/pypa/pip/issues/6252>`_)
- Fix a regression introduced in 19.0.2 where the filename in a RECORD file
of an installed file would not be updated when installing a wheel. (`#6266 <https://github.com/pypa/pip/issues/6266>`_)
19.0.2 (2019-02-09)
===================
Bug Fixes
---------
- Fix a crash where PEP 517-based builds using ``--no-cache-dir`` would fail in
some circumstances with an ``AssertionError`` due to not finalizing a build
directory internally. (`#6197 <https://github.com/pypa/pip/issues/6197>`_)
- Provide a better error message if attempting an editable install of a
directory with a ``pyproject.toml`` but no ``setup.py``. (`#6170 <https://github.com/pypa/pip/issues/6170>`_)
- The implicit default backend used for projects that provide a ``pyproject.toml``
file without explicitly specifying ``build-backend`` now behaves more like direct
execution of ``setup.py``, and hence should restore compatibility with projects
that were unable to be installed with ``pip`` 19.0. This raised the minimum
required version of ``setuptools`` for such builds to 40.8.0. (`#6163 <https://github.com/pypa/pip/issues/6163>`_)
- Allow ``RECORD`` lines with more than three elements, and display a warning. (`#6165 <https://github.com/pypa/pip/issues/6165>`_)
- ``AdjacentTempDirectory`` fails on unwritable directory instead of locking up the uninstall command. (`#6169 <https://github.com/pypa/pip/issues/6169>`_)
- Make failed uninstalls roll back more reliably and better at avoiding naming conflicts. (`#6194 <https://github.com/pypa/pip/issues/6194>`_)
- Ensure the correct wheel file is copied when building PEP 517 distribution is built. (`#6196 <https://github.com/pypa/pip/issues/6196>`_)
- The Python 2 end of life warning now only shows on CPython, which is the
implementation that has announced end of life plans. (`#6207 <https://github.com/pypa/pip/issues/6207>`_)
Improved Documentation
----------------------
- Re-write README and documentation index (`#5815 <https://github.com/pypa/pip/issues/5815>`_)
19.0.1 (2019-01-23)
===================
Bug Fixes
---------
- Fix a crash when using --no-cache-dir with PEP 517 distributions (`#6158 <https://github.com/pypa/pip/issues/6158>`_, `#6171 <https://github.com/pypa/pip/issues/6171>`_)
19.0 (2019-01-22)
=================
Deprecations and Removals
-------------------------
- Deprecate support for Python 3.4 (`#6106 <https://github.com/pypa/pip/issues/6106>`_)
- Start printing a warning for Python 2.7 to warn of impending Python 2.7 End-of-life and
prompt users to start migrating to Python 3. (`#6148 <https://github.com/pypa/pip/issues/6148>`_)
- Remove the deprecated ``--process-dependency-links`` option. (`#6060 <https://github.com/pypa/pip/issues/6060>`_)
- Remove the deprecated SVN editable detection based on dependency links
during freeze. (`#5866 <https://github.com/pypa/pip/issues/5866>`_)
Features
--------
- Implement PEP 517 (allow projects to specify a build backend via pyproject.toml). (`#5743 <https://github.com/pypa/pip/issues/5743>`_)
- Implement manylinux2010 platform tag support. manylinux2010 is the successor
to manylinux1. It allows carefully compiled binary wheels to be installed
on compatible Linux platforms. (`#5008 <https://github.com/pypa/pip/issues/5008>`_)
- Improve build isolation: handle ``.pth`` files, so namespace packages are correctly supported under Python 3.2 and earlier. (`#5656 <https://github.com/pypa/pip/issues/5656>`_)
- Include the package name in a freeze warning if the package is not installed. (`#5943 <https://github.com/pypa/pip/issues/5943>`_)
- Warn when dropping an ``--[extra-]index-url`` value that points to an existing local directory. (`#5827 <https://github.com/pypa/pip/issues/5827>`_)
- Prefix pip's ``--log`` file lines with their timestamp. (`#6141 <https://github.com/pypa/pip/issues/6141>`_)
Bug Fixes
---------
- Avoid creating excessively long temporary paths when uninstalling packages. (`#3055 <https://github.com/pypa/pip/issues/3055>`_)
- Redact the password from the URL in various log messages. (`#4746 <https://github.com/pypa/pip/issues/4746>`_, `#6124 <https://github.com/pypa/pip/issues/6124>`_)
- Avoid creating excessively long temporary paths when uninstalling packages. (`#3055 <https://github.com/pypa/pip/issues/3055>`_)
- Avoid printing a stack trace when given an invalid requirement. (`#5147 <https://github.com/pypa/pip/issues/5147>`_)
- Present 401 warning if username/password do not work for URL (`#4833 <https://github.com/pypa/pip/issues/4833>`_)
- Handle ``requests.exceptions.RetryError`` raised in ``PackageFinder`` that was causing pip to fail silently when some indexes were unreachable. (`#5270 <https://github.com/pypa/pip/issues/5270>`_, `#5483 <https://github.com/pypa/pip/issues/5483>`_)
- Handle a broken stdout pipe more gracefully (e.g. when running ``pip list | head``). (`#4170 <https://github.com/pypa/pip/issues/4170>`_)
- Fix crash from setting ``PIP_NO_CACHE_DIR=yes``. (`#5385 <https://github.com/pypa/pip/issues/5385>`_)
- Fix crash from unparsable requirements when checking installed packages. (`#5839 <https://github.com/pypa/pip/issues/5839>`_)
- Fix content type detection if a directory named like an archive is used as a package source. (`#5838 <https://github.com/pypa/pip/issues/5838>`_)
- Fix listing of outdated packages that are not dependencies of installed packages in ``pip list --outdated --not-required`` (`#5737 <https://github.com/pypa/pip/issues/5737>`_)
- Fix sorting ``TypeError`` in ``move_wheel_files()`` when installing some packages. (`#5868 <https://github.com/pypa/pip/issues/5868>`_)
- Fix support for invoking pip using ``python src/pip ...``. (`#5841 <https://github.com/pypa/pip/issues/5841>`_)
- Greatly reduce memory usage when installing wheels containing large files. (`#5848 <https://github.com/pypa/pip/issues/5848>`_)
- Editable non-VCS installs now freeze as editable. (`#5031 <https://github.com/pypa/pip/issues/5031>`_)
- Editable Git installs without a remote now freeze as editable. (`#4759 <https://github.com/pypa/pip/issues/4759>`_)
- Canonicalize sdist file names so they can be matched to a canonicalized package name passed to ``pip install``. (`#5870 <https://github.com/pypa/pip/issues/5870>`_)
- Properly decode special characters in SVN URL credentials. (`#5968 <https://github.com/pypa/pip/issues/5968>`_)
- Make ``PIP_NO_CACHE_DIR`` disable the cache also for truthy values like ``"true"``, ``"yes"``, ``"1"``, etc. (`#5735 <https://github.com/pypa/pip/issues/5735>`_)
Vendored Libraries
------------------
- Include license text of vendored 3rd party libraries. (`#5213 <https://github.com/pypa/pip/issues/5213>`_)
- Update certifi to 2018.11.29
- Update colorama to 0.4.1
- Update distlib to 0.2.8
- Update idna to 2.8
- Update packaging to 19.0
- Update pep517 to 0.5.0
- Update pkg_resources to 40.6.3 (via setuptools)
- Update pyparsing to 2.3.1
- Update pytoml to 0.1.20
- Update requests to 2.21.0
- Update six to 1.12.0
- Update urllib3 to 1.24.1
Improved Documentation
----------------------
- Include the Vendoring Policy in the documentation. (`#5958 <https://github.com/pypa/pip/issues/5958>`_)
- Add instructions for running pip from source to Development documentation. (`#5949 <https://github.com/pypa/pip/issues/5949>`_)
- Remove references to removed ``#egg=<name>-<version>`` functionality (`#5888 <https://github.com/pypa/pip/issues/5888>`_)
- Fix omission of command name in HTML usage documentation (`#5984 <https://github.com/pypa/pip/issues/5984>`_)
18.1 (2018-10-05)
=================
Features
--------
- Allow PEP 508 URL requirements to be used as dependencies.
As a security measure, pip will raise an exception when installing packages from
PyPI if those packages depend on packages not also hosted on PyPI.
In the future, PyPI will block uploading packages with such external URL dependencies directly. (`#4187 <https://github.com/pypa/pip/issues/4187>`_)
- Allows dist options (--abi, --python-version, --platform, --implementation) when installing with --target (`#5355 <https://github.com/pypa/pip/issues/5355>`_)
- Support passing ``svn+ssh`` URLs with a username to ``pip install -e``. (`#5375 <https://github.com/pypa/pip/issues/5375>`_)
- pip now ensures that the RECORD file is sorted when installing from a wheel file. (`#5525 <https://github.com/pypa/pip/issues/5525>`_)
- Add support for Python 3.7. (`#5561 <https://github.com/pypa/pip/issues/5561>`_)
- Malformed configuration files now show helpful error messages, instead of tracebacks. (`#5798 <https://github.com/pypa/pip/issues/5798>`_)
Bug Fixes
---------
- Checkout the correct branch when doing an editable Git install. (`#2037 <https://github.com/pypa/pip/issues/2037>`_)
- Run self-version-check only on commands that may access the index, instead of
trying on every run and failing to do so due to missing options. (`#5433 <https://github.com/pypa/pip/issues/5433>`_)
- Allow a Git ref to be installed over an existing installation. (`#5624 <https://github.com/pypa/pip/issues/5624>`_)
- Show a better error message when a configuration option has an invalid value. (`#5644 <https://github.com/pypa/pip/issues/5644>`_)
- Always revalidate cached simple API pages instead of blindly caching them for up to 10
minutes. (`#5670 <https://github.com/pypa/pip/issues/5670>`_)
- Avoid caching self-version-check information when cache is disabled. (`#5679 <https://github.com/pypa/pip/issues/5679>`_)
- Avoid traceback printing on autocomplete after flags in the CLI. (`#5751 <https://github.com/pypa/pip/issues/5751>`_)
- Fix incorrect parsing of egg names if pip needs to guess the package name. (`#5819 <https://github.com/pypa/pip/issues/5819>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2018.8.24
- Upgrade packaging to 18.0
- Upgrade pyparsing to 2.2.1
- Add pep517 version 0.2
- Upgrade pytoml to 0.1.19
- Upgrade pkg_resources to 40.4.3 (via setuptools)
Improved Documentation
----------------------
- Fix "Requirements Files" reference in User Guide (`#user_guide_fix_requirements_file_ref <https://github.com/pypa/pip/issues/user_guide_fix_requirements_file_ref>`_)
18.0 (2018-07-22)
=================
Process
-------
- Switch to a Calendar based versioning scheme.
- Formally document our deprecation process as a minimum of 6 months of deprecation
warnings.
- Adopt and document NEWS fragment writing style.
- Switch to releasing a new, non-bug fix version of pip every 3 months.
Deprecations and Removals
-------------------------
- Remove the legacy format from pip list. (#3651, #3654)
- Dropped support for Python 3.3. (#3796)
- Remove support for cleaning up #egg fragment postfixes. (#4174)
- Remove the shim for the old get-pip.py location. (#5520)
For the past 2 years, it's only been redirecting users to use the newer
https://bootstrap.pypa.io/get-pip.py location.
Features
--------
- Introduce a new --prefer-binary flag, to prefer older wheels over newer source packages. (#3785)
- Improve autocompletion function on file name completion after options
which have ``<file>``, ``<dir>`` or ``<path>`` as metavar. (#4842, #5125)
- Add support for installing PEP 518 build dependencies from source. (#5229)
- Improve status message when upgrade is skipped due to only-if-needed strategy. (#5319)
Bug Fixes
---------
- Update pip's self-check logic to not use a virtualenv specific file and honor cache-dir. (#3905)
- Remove compiled pyo files for wheel packages. (#4471)
- Speed up printing of newly installed package versions. (#5127)
- Restrict install time dependency warnings to directly-dependant packages. (#5196, #5457)
Warning about the entire package set has resulted in users getting confused as
to why pip is printing these warnings.
- Improve handling of PEP 518 build requirements: support environment markers and extras. (#5230, #5265)
- Remove username/password from log message when using index with basic auth. (#5249)
- Remove trailing os.sep from PATH directories to avoid false negatives. (#5293)
- Fix "pip wheel pip" being blocked by the "don't use pip to modify itself" check. (#5311, #5312)
- Disable pip's version check (and upgrade message) when installed by a different package manager. (#5346)
This works better with Linux distributions where pip's upgrade message may
result in users running pip in a manner that modifies files that should be
managed by the OS's package manager.
- Check for file existence and unlink first when clobbering existing files during a wheel install. (#5366)
- Improve error message to be more specific when no files are found as listed in as listed in PKG-INFO. (#5381)
- Always read ``pyproject.toml`` as UTF-8. This fixes Unicode handling on Windows and Python 2. (#5482)
- Fix a crash that occurs when PATH not set, while generating script location warning. (#5558)
- Disallow packages with ``pyproject.toml`` files that have an empty build-system table. (#5627)
Vendored Libraries
------------------
- Update CacheControl to 0.12.5.
- Update certifi to 2018.4.16.
- Update distro to 1.3.0.
- Update idna to 2.7.
- Update ipaddress to 1.0.22.
- Update pkg_resources to 39.2.0 (via setuptools).
- Update progress to 1.4.
- Update pytoml to 0.1.16.
- Update requests to 2.19.1.
- Update urllib3 to 1.23.
Improved Documentation
----------------------
- Document how to use pip with a proxy server. (#512, #5574)
- Document that the output of pip show is in RFC-compliant mail header format. (#5261)
10.0.1 (2018-04-19)
===================
Features
--------
- Switch the default repository to the new "PyPI 2.0" running at
https://pypi.org/. (#5214)
Bug Fixes
---------
- Fix a bug that made get-pip.py unusable on Windows without renaming. (#5219)
- Fix a TypeError when loading the cache on older versions of Python 2.7.
(#5231)
- Fix and improve error message when EnvironmentError occurs during
installation. (#5237)
- A crash when reinstalling from VCS requirements has been fixed. (#5251)
- Fix PEP 518 support when pip is installed in the user site. (#5524)
Vendored Libraries
------------------
- Upgrade distlib to 0.2.7
10.0.0 (2018-04-14)
===================
Bug Fixes
---------
- Prevent false-positive installation warnings due to incomplete name
normalization. (#5134)
- Fix issue where installing from Git with a short SHA would fail. (#5140)
- Accept pre-release versions when checking for conflicts with pip check or pip
install. (#5141)
- ``ioctl(fd, termios.TIOCGWINSZ, ...)`` needs 8 bytes of data (#5150)
- Do not warn about script location when installing to the directory containing
sys.executable. This is the case when 'pip install'ing without activating a
virtualenv. (#5157)
- Fix PEP 518 support. (#5188)
- Don't warn about script locations if ``--target`` is specified. (#5203)
10.0.0b2 (2018-04-02)
=====================
Bug Fixes
---------
- Fixed line endings in CA Bundle - 10.0.0b1 was inadvertently released with Windows
line endings. (#5131)
10.0.0b1 (2018-03-31)
=====================
Deprecations and Removals
-------------------------
- Removed the deprecated ``--egg`` parameter to ``pip install``. (#1749)
- Removed support for uninstalling projects which have been installed using
distutils. distutils installed projects do not include metadata indicating
what files belong to that install and thus it is impossible to *actually*
uninstall them rather than just remove the metadata saying they've been
installed while leaving all of the actual files behind. (#2386)
- Removed the deprecated ``--download`` option to ``pip install``. (#2643)
- Removed the deprecated --(no-)use-wheel flags to ``pip install`` and ``pip
wheel``. (#2699)
- Removed the deprecated ``--allow-external``, ``--allow-all-external``, and
``--allow-unverified`` options. (#3070)
- Switch the default for ``pip list`` to the columns format, and deprecate the
legacy format. (#3654, #3686)
- Deprecate support for Python 3.3. (#3796)
- Removed the deprecated ``--default-vcs`` option. (#4052)
- Removed the ``setup.py test`` support from our sdist as it wasn't being
maintained as a supported means to run our tests. (#4203)
- Dropped support for Python 2.6. (#4343)
- Removed the --editable flag from pip download, as it did not make sense
(#4362)
- Deprecate SVN detection based on dependency links in ``pip freeze``. (#4449)
- Move all of pip's APIs into the pip._internal package, properly reflecting
the fact that pip does not currently have any public APIs. (#4696, #4700)
Features
--------
- Add `--progress-bar <progress_bar>` to ``pip download``, ``pip install`` and
``pip wheel`` commands, to allow selecting a specific progress indicator or,
to completely suppress, (for example in a CI environment) use
``--progress-bar off```. (#2369, #2756)
- Add `--no-color` to `pip`. All colored output is disabled if this flag is
detected. (#2449)
- pip uninstall now ignores the absence of a requirement and prints a warning.
(#3016, #4642)
- Improved the memory and disk efficiency of the HTTP cache. (#3515)
- Support for packages specifying build dependencies in pyproject.toml (see
`PEP 518 <https://www.python.org/dev/peps/pep-0518/>`__). Packages which
specify one or more build dependencies this way will be built into wheels in
an isolated environment with those dependencies installed. (#3691)
- pip now supports environment variable expansion in requirement files using
only ``${VARIABLE}`` syntax on all platforms. (#3728)
- Allowed combinations of -q and -v to act sanely. Then we don't need warnings
mentioned in the issue. (#4008)
- Add `--exclude-editable` to ``pip freeze`` and ``pip list`` to exclude
editable packages from installed package list. (#4015, #4016)
- Improve the error message for the common ``pip install ./requirements.txt``
case. (#4127)
- Add support for the new ``@ url`` syntax from PEP 508. (#4175)
- Add setuptools version to the statistics sent to BigQuery. (#4209)
- Report the line which caused the hash error when using requirement files.
(#4227)
- Add a pip config command for managing configuration files. (#4240)
- Allow ``pip download`` to be used with a specific platform when ``--no-deps``
is set. (#4289)
- Support build-numbers in wheel versions and support sorting with
build-numbers. (#4299)
- Change pip outdated to use PackageFinder in order to do the version lookup so
that local mirrors in Environments that do not have Internet connections can