Pylint: inherit-non-class false positive: NamedTuple (Python 3.9)

[belm0]

Steps to reproduce

class Employee(NamedTuple):
    name: str
    id: int

Current behavior

E0239: Inheriting 'NamedTuple', which is not a class. (inherit-non-class)

Expected behavior

no error

pylint --version output

$ pylint --version
pylint 2.6.0
astroid 2.4.2
Python 3.9.0rc2+ (heads/3.9:d571924, Oct  5 2020, 11:56:25)
[Clang 9.0.0 (clang-900.0.39.2)]

[hippo91]

@belm0 thanks for the report. I can reproduce it (i need to import NamedTuple from typing module). It seems to be specific to python 3.9 as there is not such error with python 3.8.

[belm0]

yes, is should be labeled with "regression" if possible

[hippo91]

@belm0 this is not a pylint regression because the pylint behavior has not changed. It is "just" an adaptation to python 3.9 that need to be handled.

[tirkarthi]

Seems to be same as https://github.com/PyCQA/pylint/issues/3884. This was raised upstream : https://bugs.python.org/issue41973

[hippo91]

@tirkarthi thanks for your comment. It is indeed the same issue as #3884. I keep this issue open and close #3884.

[pjljvandelaar]

I also receive the pylint warning: "R0903: Too few public methods (0/2) (too-few-public-methods)" on NamedTuples in python 3.9.0.
Am I right to assume that this unexpected warning is also part of this bug report?

[hippo91]

@pjljvandelaar you are right. Both problem arise from the same reason. It is also linked to #3895 and should be addressed soon, once PyCQA/astroid#858 will be merged.