James Stroud wrote:
Hello All,
I subclassed dict and overrode __setitem__. When instances are
unpickled, the __setstate__ is not called before the keys are assigned
via __setitem__ in the unpickling protocol.
I googled a bit and found that this a bug filed in 2003:
http://bugs.python.org/issue826897
It is still "open" with "normal" priority.
Am I missing something? Is there a workaround for this bug that makes
fixing it pointless or has it just fallen through the cracks for the
last 5 years?
Try this:
def __newobj__(cls, *args):
return cls.__new__(cls, *args)
class DictPlus(dict):
def __init__(self, *args, **kwargs):
dict.__init__(self, *args, **kwargs)
self.extra_thing = ExtraThingClass()
def __setitem__(self, k, v):
do_something_with(self.extra_thing, k, v)
dict.__setitem__(self, k, v)
def __setstate__(self, state):
dict.update(self, state[0])
self.__dict__.update(state[1])
def __reduce__(self):
state = (dict(self), self.__dict__)
return (__newobj__, (self.__class__,), state)
Christian
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