Fails `mypy --strict` because of reexports

[AMDmi3]

Long story short

With python 3.7, fresh mypy 0.711:

import aiohttp
aiohttp.ClientSession

% mypy --strict test.py
test.py:3: error: Module has no attribute "ClientSession"

This happens because mypy --strict expects imported stuff reexported as in

from .client import BaseConnector as BaseConnector

while aiohttp/__init.py__ just imports stuff:

from .client import (BaseConnector, ...)

Related: python/mypy#7067

Expected behaviour

Clean mypy --strict, as these errors break checking code which uses aiohttp

[webknjaz]

Feel free to send a PR :)

[AMDmi3]

Would it be OK stylewise to just convert to a bunch of from .foo import bar as bar lines?

[webknjaz]

That's a question to @asvetlov. I don't mind personally.

[asvetlov]

Would it be OK stylewise to just convert to a bunch of from .foo import bar as bar lines?

Yes. Whatever works for you and isort tool :)

Please make sure that both __init__.py and web.py are processed.
[mypy] section from setup.cfg worth to be upgraded to support the most strict mode.
The problem is that mypy doesn't support strict=true in config files but requires decomposition of this mode into a bunch of separate flags. mypy is expanding, new options are added to the tool but we didn't change our config file yet.