[issue43162] Enum regression: AttributeError when accessing class variables on instances

[Ethan Furman]

Ethan Furman <et...@stoneleaf.us> added the comment:

Dylan, it's not the `from_str()` method, but the `__str__` method that is the 
problem.  Instead of

    def __str__(self):
        if self is self.EXITCODE: 
            return 'exitcode' 

it should be

    def __str__(self):

        cls = self.__class__

        if self is cls.EXITCODE: 
            return 'exitcode'

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<https://bugs.python.org/issue43162>
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