[issue9616] copy.deepcopy() copying pointers from a dict/dict/list, should copy values
New submission from Neil Harkins :
hi. after using deepcopy() on a nested dict/list structure,
i noticed that modifications to the deepcopied structure were
affecting the original. this looks to me like a serious bug:
>>> import copy
>>> foo = { 'a':[1,2,3], 'b':{'c':[4,5]} }
>>> bar = copy.deepcopy(foo)
>>> id(foo)
4297360512
>>> id(bar)
4297373104
>>> id(foo['a'])
4299410752
>>> id(bar['a'])
4299760200
>>> id(foo['b'])
4297371984
>>> id(bar['b'])
4297373920
>>> id(foo['b']['c'])
4299721040
>>> id(bar['b']['c'])
4299761496
>>> id(foo['b']['c'][0])
4297074656
>>> id(bar['b']['c'][0])
4297074656
--
components: Extension Modules
messages: 114007
nosy: nharkins
priority: normal
severity: normal
status: open
title: copy.deepcopy() copying pointers from a dict/dict/list, should copy
values
type: behavior
versions: Python 2.6
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[issue9616] copy.deepcopy() copying pointers from a dict/dict/list, should copy values
Neil Harkins added the comment: thanks for the quick response. that was just my working up a simplified repro, but you are correct: on modification there, it gets a new id() location. totally not what i would've expected (python flags it for copying when it changes, to save space?) however i am still seeing the problem in my code, so i will continue to whittle it down to a simpler repro, and hopefully add it here later today. -- ___ Python tracker <http://bugs.python.org/issue9616> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9616] copy.deepcopy() copying pointers from a dict/dict/list, should copy values
Neil Harkins added the comment: learn something everyday. i have found the bug in my code, deepcopy() is not to blame. thx for your time! -- status: open -> closed ___ Python tracker <http://bugs.python.org/issue9616> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
