[issue44922] isinstance breaks on imported dataclasses

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

I get a circular import error:

Traceback (most recent call last):
  File "main.py", line 1, in <module>
    import codegen
  File "/cygdrive/c/home/eric/codegen.py", line 1, in <module>
    from main import AtomX
  File "/cygdrive/c/home/eric/main.py", line 9, in <module>
    codegen.inheritance_map(AtomX("qwerty"))
AttributeError: partially initialized module 'codegen' has no attribute 'inheritance_map' (most likely due to a circular import)

So I can't reproduce this problem.

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nosy: +eric.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44922>
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