I'm trying to type hint the Process class returned by asyncio.create_subprocess_exec() but am getting a weak warning (Accessing a protected member of a class or a module inspection) in PyCharm, using Python 3.10 as interpreter.
My code:
from asyncio.subprocess import Process
...
self.process: Process = await asyncio.create_subprocess_exec(
*run_cmd,
stdout=asyncio.subprocess.PIPE,
)
What is the Pythonic way of resolving this warning?
This happens because for some strange reason the Process class is not included in the asyncio.subprocess.__all__ list.
When a module defines a specific __all__ list and you import names from that module that do not appear in that list, PyCharm issues a warning because it considers that to be similar to importing protected names (starting with one underscore _).
Since PY-8656 PyCharm supports the noqa directives used by flake8 to exclude a line from linter checks.
Therefore the simplest solution is to just add such a directive to the import line:
from asyncio.subprocess import Process # noqa
process: Process
...
This has no impact on the type hints with Process. It is still recognized as a type by any type checker and its (public) methods are still exposed and known.