Bugs item #1326448, was opened at 2005-10-14 08:38
Message generated for change (Comment added) made by zseil
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Category: None
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: George Sakkis (gsakkis)
Assigned to: Tim Peters (tim_one)
Summary: set.__getstate__ is not overriden
Initial Comment:
>>> import pickle
>>> class Foo(set):
... def __getstate__(self): assert False
>>> pickle.dumps(Foo())
# doesn't raise AssertionError
The same happens with frozenset.
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Comment By: iga Seilnacht (zseil)
Date: 2006-04-01 03:37
Message:
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The problem is that __reduce__() and __reduce_ex__()
have complete control over the process of pickling.
The simple solution would be to switch to the
__getnewargs__() method for pickle protocol 2
(this is simple, __getnewargs__() should
return a tuple which is passed to the constructor
when unpickling. This means that you can reuse the
part of the current code that creates the args tuple)
For protocols 0 and 1, the following should be added
to the copy_reg module:
def pickle_set(s):
return set, list(s)
pickle(set, pickle_set, set)
def pickle_frozenset(s):
return frozenset, list(s)
pickle(set, pickle_set, set)
The other options are:
- copy the semantics from object_reduce_ex
- add support directly to pickle and cPickle
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Comment By: Raymond Hettinger (rhettinger)
Date: 2005-10-14 16:37
Message:
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Tim, do you have any thoughts on this? I'm unclear on
whether this is a bug in set(), in copy_reg, in pickle, or
even a bug at all.
setobject.c implements pickling via a __reduce__() method.
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