Erez Zinman <[email protected]> added the comment:
Just to be clear, what I did is (works with both "copy" and "pickle"):
```
def _new_and_init(cls):
inst = cls.__new__(cls)
OrderedDict.__init__(inst)
return inst
class A(OrderedDict):
def __reduce__(self):
# This fixes a bug in Python 3.6
ret = list(super().__reduce__())
ret[0] = _new_and_init
ret[1] = (self.__class__, )
return tuple(ret)
```
And that works... I also verified that indeed old->new pickling will just call
_init__ on unpickling, so this would just retain the previous behavior.
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<https://bugs.python.org/issue41751>
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