Use the tool com2ann to automatically convert most type comments to type
annotations. Some type comments continue to exist where any work beyond
the automatic conversion was required (for example, additional
formatting or circular references).
For additional information on the com2ann tool, see:
https://github.com/ilevkivskyi/com2ann
The typing module has been available since Python 3.5. Guarding the
import has been unnecessary since dropping Python 2.
Some guards remain to either:
- Avoid circular imports
- Importing objects that are also guarded by typing.TYPE_CHECKING
- Avoid mypy_extensions dependency
The stdlib module has been available since Python 3.5 and the
TYPE_CHECKING constant has been available since 3.5.2.
By using stdlib, this removes the need for pip to maintain its own
Python 2 typing compatibility shim.
Now that Python 2 is not supported, the bytes/str boundaries are more
clear and explicit. Using six.ensure_* methods for backwards
compatibility is no longer necessary as the types are known and verified
using mypy.
One exception is tests/lib/wheel.py which allows tests to pass test
setup data as either bytes or str.
The module operations.install.wheel also remains untouched as it is
especially delicate to bytes/str mixups and the current version is
working.
Use pyupgrade to convert simple string formatting to use f-string
syntax. pyupgrade is intentionally timid and will not create an f-string
if it would make the expression longer or if the substitution parameters
are anything but simple names or dotted names.
We now extract all metadata files from the wheel directly into memory
and make them available to the wrapping pkg_resources.Distribution via
the DictMetadata introduced earlier.
In order to parse metadata from wheel files directly we want to reuse
parse_wheel. Moving it out helps avoid creating an unnecessary
dependence on operations.install.wheel.
Damian Shaw
Tzu-ping Chung
Jon Dufresne
Andrey Bienkowski
Hugo van Kemenade
Chris Hunt
Pradyun Gedam
Deepak Sharma