str(weakref) throws error KeyError: '__name__' if the original obj override __getattr__ #99184
Description
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
