>>> x=[[0]*2]*2
This replicates the references. It doesn't copy objects.
This short transcript demonstrates that concept:
>>> x = [[0, 0], [0, 0]]
>>> map(id, x)
[16988720, 16988160]
>>> y = [[0]*2]*2
>>> y
[[0, 0], [0, 0]]
>>> map(id, y)
[16988520, 16988520]
The object x refers to is a list with references to two other lists. The
object y refers to is a list with two references to the same list.
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