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
Removes the vendored contextlib2.
ExitStack and suppress are available from stdlib contextlib on all
supported Python versions.
The nullcontext context manager which isn't available in Python 3.6, but
the function is simple to implement. Once Python 3.6 support is dropped,
so too can the compat shim.
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.
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.
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.
