Issue 1443328: Pickle protocol 2 fails on private slots. (original) (raw)

Issue1443328

Created on 2006-03-05 04:18 by dvarrazzo, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (4)
msg27680 - (view)	Author: Daniele Varrazzo (dvarrazzo) *	Date: 2006-03-05 04:18
The pickling protocol 2 can manage new style objects defining __slots__ and without __dict__. Anyway it fails when one of the slots is "private". >>> class C1(object): __slots__ = ["__priv"] def __init__(self): self.__priv = 42 def get_priv(self): return self.__priv >>> C1().get_priv() 42 >>> import pickle >>> pickle.loads(pickle.dumps(C1(), 2)).get_priv() Traceback (most recent call last): File "<pyshell#258>", line 1, in -toplevel- pickle.loads(pickle.dumps(C1(), 2)).get_priv() File "<pyshell#255>", line 6, in get_priv return self.__priv AttributeError: _C1__priv of course redefining __getstate__ and __setstate__ bypasses the problem. the cPickle module shows the same issue.
msg27681 - (view)	Author: Georg Brandl (georg.brandl) *	Date: 2006-03-09 08:21
Logged In: YES user_id=849994 Confirmed with pickle and cPickle here.
msg27682 - (view)	Author: Ziga Seilnacht (zseil) *	Date: 2006-03-27 05:50
Logged In: YES user_id=1326842 The bug is in the copy_reg module. object.__reduce_ex__ calls function _slotnames in that module. There is another bug when __slots__ is a single string. Examples below. >>> import copy_reg >>> class A(object): ... __slots__ = ('__spam',) ... >>> class B(object): ... __slots__ = 'spam' ... >>> copy_reg._slotnames(A) # should be ['_A__spam'] ['__spam'] >>> copy_reg._slotnames(B) # should be ['spam'] ['s', 'p', 'a', 'm']
msg27683 - (view)	Author: Georg Brandl (georg.brandl) *	Date: 2006-03-31 18:27
Logged In: YES user_id=849994 Fixed with commit of patch #1462313.