Nested Lists Assignment Problem

[Fredrik Lundh]

"Licheng Fang" wrote:

>I wanna use nested lists as an array, but here's the problem:
>
>>>> a = [[0]*3]*3
>>>> a
> [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
>>>> a[0][0] = 1
>>>> a
> [[1, 0, 0], [1, 0, 0], [1, 0, 0]]
>
> Could anybody please explain to me why three values were change? I'm
> bewildered. Thanks!

http://pyfaq.infogami.com/how-do-i-create-a-multidimensional-list

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