[New-bugs-announce] [issue24589] Wrong behavior for list of lists

[Jos Dechamps]

New submission from Jos Dechamps:

After creating a list of lists, changing one element, leads to changes of all the elements:

>>> v=[[]]*10
>>> v
[[], [], [], [], [], [], [], [], [], []]
>>> v[3].append(3)
>>> v
[[3], [3], [3], [3], [3], [3], [3], [3], [3], [3]]
>>> 
>>> v=[[]]*10
>>> v
[[], [], [], [], [], [], [], [], [], []]
>>> v[3] += [3]
>>> v
[[3], [3], [3], [3], [3], [3], [3], [3], [3], [3]]
>>>

----------
components: Interpreter Core
messages: 246450
nosy: dechamps
priority: normal
severity: normal
status: open
title: Wrong behavior for list of lists
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24589>
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