Pylint: Undefined variable '__class__' (undefined-variable) seems back with Python 3.8

[adelton]

Steps to reproduce

1. Have test.py with content

class Class:
    def method(self):
        print(__class__)
Class().method()

1. Run pylint-3 --disable=R --disable=C test.py

Current behavior

************* Module test
/test.py:3:14: E0602: Undefined variable '__class__' (undefined-variable)

--------------------------------------------------------------------
Your code has been rated at -2.50/10 (previous run: -6.67/10, +4.17)

Expected behavior

Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

pylint --version output

pylint-3 2.3.1
astroid 2.3.0
Python 3.8.0b4 (default, Aug 30 2019, 00:00:00) 
[GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]

This is on Fedora rawhide with Python 3.8.

The expected behaviour is from Fedora 30 with Python 3.7:

pylint-3 2.3.1
astroid 2.2.5
Python 3.7.4 (default, Jul  9 2019, 16:32:37) 
[GCC 9.1.1 20190503 (Red Hat 9.1.1-1)]

Similar issue was reported before (and resolved) as https://github.com/PyCQA/pylint/issues/1328.

[PCManticore]

Thanks, I can reproduce the issue.

[adelton]

Actually, this does not seem to be Python 3.8 specific. I see the issue on Fedora 31 (run in registry.fedoraproject.org/fedora:31 container) with Python 3.7 as well:

# pylint-3 --version
pylint-3 2.3.1
astroid 2.3.0
Python 3.7.4 (default, Aug 12 2019, 14:45:07) 
[GCC 9.1.1 20190605 (Red Hat 9.1.1-2)]

Is astroid (2.3.0 vs. 2.2.5 on Fedora 30 where the issue does not manifest itself) the culprit?

[SamyCookie]

I agree, it's not Python version related issue. I got this one with the new Pylint version and Python 3.5 :

pylint 2.4.2
astroid 2.3.1
Python 3.5.3 (default, Sep 27 2018, 17:25:39) 
[GCC 6.3.0 20170516]

and I think @adelton is right, it is related to astroid version (>= 2.3)

[Mi-La]

Hi, any plans to fix it? Or are there any problems causing that it cannot be fixed? I'm not happy to use the self.__class__ workaround. Do you have any suggestions how to workaround it nicely? Is it a bad habit to use __class__ at all?
(I get this error E0602: Undefined variable '__class__' (undefined-variable) with pylint 2.4.4 and python 3.6.9).