Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:

This is correct behavior.
Try making a new *copy* of the sublist:

a = [[1,2],[3,4],[5,6]]
b = a[0][:]
b[0] = -8888

----------
nosy: +rhettinger
resolution:  -> invalid
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6219>
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