James Stroud wrote:
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:
It is an 'issue' reporting a possibly unexpected side-effect of protocol
working as designed and documented. Possibly a design flaw, but not a
bug in the narrow sense (in spite of the url of the issue tracker).
http://bugs.python.org/issue826897
It is still "open" with "normal" priority.
Here is the ugly "fix" I'm basically going to have to live with, it seems:
class DictPlus(dict):
def __init__(self, *args, **kwargs):
self.extra_thing = ExtraThingClass()
dict.__init__(self, *args, **kwargs)
def __setitem__(self, k, v):
try:
do_something_with(self.extra_thing, k, v)
except AttributeError:
self.extra_thing = ExtraThingClass()
do_something_with(self.extra_thing, k, v)
dict.__setitem__(self, k, v)
def __setstate__(self, adict):
pass
I took the liberty of adding this to the issue.
I can't imagine this bug has survived
because there is no bug to fix. I have suggesting closing.
Terry Jan Reedy
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