New submission from rb <rb-os...@justgohome.co.uk>: The documentation states that the output of pickle and cPickle may be different. However it is implied that the output of a particular module will always be consistent within itself. This expectation fails for the case below.
I am using the output of cPickle in order to generate a key to use for external storage where the key is abstracted to a generic Python (immutable) object. Without consistency this breaks for me; pickle is too slow so I need to use cPickle. $ python Python 2.5.2 (r252:60911, Oct 5 2008, 19:29:17) [GCC 4.3.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cPickle >>> key = (1, u'foo') >>> cPickle.dumps(key) '(I1\nVfoo\ntp1\n.' >>> cPickle.dumps((1, u'foo')) '(I1\nVfoo\np1\ntp2\n.' PythonWin 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] on win32. Portions Copyright 1994-2008 Mark Hammond - see 'Help/About PythonWin' for further copyright information. >>> import cPickle >>> key = (1,u'foo') >>> cPickle.dumps(key) '(I1\nVfoo\ntp1\n.' >>> cPickle.dumps((1,u'foo')) '(I1\nVfoo\np1\ntp2\n.' Expected results: the output of the two dumps calls should be the same. ---------- components: Library (Lib) messages: 83814 nosy: rb severity: normal status: open title: cPickle produces inconsistent output versions: Python 2.5, Python 2.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5518> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
