Amaury Forgeot d'Arc <amaur...@gmail.com> added the comment:
The call to self.__class__() can break subclasses of OrderedDict for two
reasons:
- The subclass constructor may have a different signature
- Attributes set by the subclass.__init__ are removed from the pickle::
import collections, pickle
class Mydict(collections.OrderedDict):
def __init__(self, *args, name=None, **kwargs):
super().__init__(*args, **kwargs)
self.name = name
a = Mydict(name='foo')
b = pickle.loads(pickle.dumps(a))
print(a.name, b.name)
Previously, the 'name' would be correctly copied, now it is reset to None.
----------
nosy: +amaury.forgeotdarc
status: closed -> open
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11875>
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