mirror of https://github.com/pypa/pip
Enable importlib.metadata backend on Python 3.11
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@ -219,11 +219,12 @@ jobs:
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env:
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TEMP: "R:\\Temp"
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# TODO: Remove this when we add Python 3.11 to CI.
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tests-importlib-metadata:
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name: tests for importlib.metadata backend
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runs-on: ubuntu-latest
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env:
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_PIP_METADATA_BACKEND_IMPORTLIB: egg-compat
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_PIP_USE_IMPORTLIB_METADATA: 'true'
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needs: [pre-commit, packaging, determine-changes]
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if: >-
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@ -241,7 +242,6 @@ jobs:
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- run: pip install nox 'virtualenv<20'
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# Main check
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- name: Run unit tests
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run: >-
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nox -s test-3.10 --
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@ -0,0 +1,4 @@
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Enable the ``importlib.metadata`` metadata implementation by default on
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Python 3.11 (or later). The environment variable ``_PIP_USE_IMPORTLIB_METADATA``
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can still be used to enable the implementation on 3.10 and earlier, or disable
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it on 3.11 (by setting it to ``0`` or ``false``).
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@ -1,7 +1,11 @@
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import contextlib
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import functools
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import os
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import sys
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from typing import TYPE_CHECKING, List, Optional, Type, cast
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from pip._internal.utils.misc import strtobool
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from .base import BaseDistribution, BaseEnvironment, FilesystemWheel, MemoryWheel, Wheel
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if TYPE_CHECKING:
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@ -22,6 +26,29 @@ __all__ = [
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]
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def _should_use_importlib_metadata() -> bool:
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"""Whether to use the ``importlib.metadata`` or ``pkg_resources`` backend.
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By default, pip uses ``importlib.metadata`` on Python 3.11+, and
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``pkg_resourcess`` otherwise. This can be overriden by a couple of ways:
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* If environment variable ``_PIP_USE_IMPORTLIB_METADATA`` is set, it
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dictates whether ``importlib.metadata`` is used, regardless of Python
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version.
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* On Python 3.11+, Python distributors can patch ``importlib.metadata``
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to add a global constant ``_PIP_USE_IMPORTLIB_METADATA = False``. This
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makes pip use ``pkg_resources`` (unless the user set the aforementioned
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environment variable to *True*).
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"""
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with contextlib.suppress(KeyError, ValueError):
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return bool(strtobool(os.environ["_PIP_USE_IMPORTLIB_METADATA"]))
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if sys.version_info < (3, 11):
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return False
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import importlib.metadata
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return bool(getattr(importlib.metadata, "_PIP_USE_IMPORTLIB_METADATA", True))
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class Backend(Protocol):
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Distribution: Type[BaseDistribution]
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Environment: Type[BaseEnvironment]
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@ -29,7 +56,7 @@ class Backend(Protocol):
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@functools.lru_cache(maxsize=None)
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def select_backend() -> Backend:
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if os.environ.get("_PIP_METADATA_BACKEND_IMPORTLIB"):
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if _should_use_importlib_metadata():
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from . import importlib
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return cast(Backend, importlib)
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