Richard Levasseur <richard...@gmail.com> added the comment:
Here's a self-contained repro:
```
import pickle
class MyList(list):
def __init__(self, required, values):
self.required = required
super().__init__(values)
def __getstate__(self):
return self.required
def __setstate__(self, state):
self.required = state
def extend(self, values):
assert self.required
super().extend(values)
mylist = MyList('foo', [1, 2])
pickled = pickle.dumps(mylist)
unpickled = pickle.loads(pickled)
print(mylist)
```
The above will raise an AttributeError when self.required is accessed in
extend().
Oddly, defining a `__reduce__()` function that simply calls and returns
`super().__reduce__()` seems to restore the previous behavior and things work
again.
----------
nosy: +richardlev
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43946>
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