False positive no-member on member of generic grandparent class

[mthuurne]

Steps to reproduce

Run pylint on the following code:

from typing import Generic, TypeVar

T = TypeVar('T')

class Base(Generic[T]):
    def foo(self) -> None:
        print('bar')

class Intermediate(Base[T]):
    pass

class Concrete(Intermediate[int]):
    pass

obj = Concrete()
obj.foo()

Current behavior

The following message is reported:

E1101: Instance of 'Concrete' has no 'foo' member (no-member)

The message goes away if Concrete is made to inherit directly from Base, so without Intermediate in between them.

Expected behavior

No message is reported.

pylint --version output

pylint 2.4.0
astroid 2.3.0
Python 3.7.2 (default, Feb 26 2019, 13:02:33)
[GCC 7.3.1 20180323 [gcc-7-branch revision 258812]]

Notes

I wonder if this is related to #3129.

[PCManticore]

Thanks, I can reproduce it as well.

[jamesbraza]

I believe this is fixed as of pylint 2.7 for the provided repro above

[radkujawa]

I copied this example and tried pylint 2.7.2 and I still get this error, so I don't see how "this is fixed as of pylint 2.7 for the provided repro above".

pylint --version
pylint 2.7.2
astroid 2.5.1
Python 3.7.9 (default, Sep 25 2020, 07:46:23) 
[GCC 8.4.0]

[hippo91]

@jamesbraza @radkujawa both of you are right.
It was fixed some times ago but we have been forced to revert the fixing commit (pylint-dev/astroid@03d15b0) because it broke something else.
This will should be definitely fixed when pylint-dev/astroid#927 will be merged.

[NeilGirdhar]

Should this be closed? It appears to be fixed now! 😄

[Pierre-Sassoulas]

Thank you for the reminder @NeilGirdhar, cleaning up issue is hard :)

[NeilGirdhar]

Least I can do to help. Thank you for resolving these so quickly.