[issue24589] Wrong behavior for list of lists

[Bastiaan Albarda]

Bastiaan Albarda added the comment:

The * operator lets you use the same object multiple times, thereby saving resources. 

If you want unique objects use comprehension:
>>> v = [[] for x in range(10)]
>>> v[3].append(3)
>>> v
[[], [], [], [3], [], [], [], [], [], []]
>>> v[3] += [3]
>>> v
[[], [], [], [3, 3], [], [], [], [], [], []]

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nosy: +Bastiaan Albarda

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