[Python-ideas] Put default setstate and getstate on object for use in coöperative inheritance.

[Neil Girdhar]

When implementing getstate in coöoerative inheritance, the typical thing to 
do is to call super to get dictionary and add the appropriate entries. 
 Setstate is similar: you extract what you need out of the dictionary and 
call super with the remaining entries.  Unfortunately, object does not have 
a default implementation, so you need a base class like so:

class DefaultSetstateAndGetstate:

    """
    Define default getstate and setstate for use in coöperative inheritance.
    """
    def __getstate__(self):
        return self.__dict__.copy()

    def __setstate__(self, state):
        self.__dict__.update(state)


I suggest that this be added to object.

Best,

Neil
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