unsubscriptable-object error reported incorrectly

[pbasista]

Steps to reproduce

Run Pylint on the following code:

from typing import Generic, TypeVar

T = TypeVar("T")

class Test(Generic[T]):  # error is reported here
    pass

Current behavior

Pylint reports the following error:
E1136: Value 'Generic' is unsubscriptable (unsubscriptable-object)

Expected behavior

No error should be reported. Python documentation for Generic explicitly lists use cases where Generic is subscripted.

pylint --version output

$ pylint --version
pylint 2.1.1
astroid 2.0.4
Python 3.7.0 (default, Jun 27 2018, 14:40:03) 
[GCC 8.1.0]

This issue is not reproducible with Python 3.6. Might be related to issue #2377, which is only reproducible with Python 3.6.

[pcorpet]

I believe this is due to Generic using __class_getitem__, see source code. And pylint does not handle __class_getitem__ yet.

PEP 560 introduced __class_getitem__.

[PCManticore]

Thanks @pcorpet for the PR!

[idchlife]

Thanks for hard work at pylint!

Is it possible to use version with fix for Generic?

[vyshkant]

@PCManticore Could you please release this fix?

[PCManticore]

@vyshkant I'll do a Pylint release today.

[belvedere-trading-user]

Thank you! I can verify that this fixed the issue on our end.