[issue7917] list of list created by *

[Andrew Chong]

New submission from Andrew Chong <sledge76 at hotmail.com>:

This shows unexpected behavior.

>>> data2 = [[]] * 4
>>> print data2
[[], [], [], []]
>>> data2[0] += [(0,1)]
>>> print data2
[[(0, 1)], [(0, 1)], [(0, 1)], [(0, 1)]]

I added a tuple to only 0th list, but it got added to all the lists in the global list.

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components: +None
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7917>
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