String enum values not recognized (false positive invalid-str-returned)

[ppentchev]

Steps to reproduce

1. Run pylint on the attached xenum.py file.
2. Wonder why it says that the returned value is not a string even for the classes that explicitly subclass "str" before "Enum" and regardless of the isinstance assertion that's good enough for mypy. (now why would mypy need the assertion even for the classes that explicitly subclass str before Enum is a completely different topic for a completely different venue)

Current behavior

E0307: __str__ does not return str (invalid-str-returned) reported for all four methods.

Expected behavior

Nothing reported at all.

pylint --version output

pylint 2.5.2
astroid 2.4.1
Python 3.8.3 (default, May 26 2020, 08:47:10)
[GCC 9.3.0]
xenum-py.txt

[Snawoot]

I also have this issue. Code:

class LogLevel(enum.IntEnum):
    debug = logging.DEBUG
    info = logging.INFO
    warn = logging.WARN
    error = logging.ERROR
    fatal = logging.FATAL
    crit = logging.CRITICAL

    def __str__(self):
        return self.name

[Pierre-Sassoulas]

Closing because it's been fixed in the main branch.