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Bug report
A clear and concise description of what the bug is.
Include a minimal, reproducible example (https://stackoverflow.com/help/minimal-reproducible-example), if possible.
Repo:
class MyConfig(dict): def __getattr__(self, x): return self[x]obj = MyConfig(offset=5)obj_weakref = weakref.ref(obj)str(obj_weakref) # raise error: KeyError: '__name__'Error:
Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in __getattr__KeyError: '__name__'Your environment
- CPython versions tested on: python 3.8 & 3.9
- Operating system and architecture: Ubuntu Linux and MacOS