[Python] Why does this code for initializing a list of lists apparently link the lists...

I intend to initialize a list of list with length of n.

x = [[]] * n


However, this somehow links the lists together.

>>> x = [[]] * 3
>>> x[1].append(0)
>>> x
[[0], [0], [0]]


I expect to have something like:

[[], [0], []]


Any ideas?

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