root[:]=[root,root]

[YAN HUA]

Hi,all. Could anybody tell how this code works?
>>> root = [None, None]
>>> root[:] = [root, root]
>>> root
[[...], [...]]
>>> root[0]
[[...], [...]]
>>> root[0][0][1][1][0][0][0][1][1]
[[...], [...]]
>>>

Thanks.
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