Fabian Raab added the comment:
It seems to that this problem is affecting __new__ methods independent of
exceptions:
>>> class NewBreaker:
... def __new__(cls, arg):
... return super().__new__(cls)
...
>>> nb = NewBreaker(42)
>>> import pickle
>>> dumped = pickle.dumps(nb)
>>> pickle.loads(dumped)
Traceback (most recent call last):
File "", line 1, in
TypeError: __new__() missing 1 required positional argument: 'arg'
--
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<https://bugs.python.org/issue37287>
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