Why we change the value of a[0][0] and a[:][0] are all changed with the following list[list[]] initialization method?
a= [[0]*n]*m
a
Out[2]: [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
a[0][0]=5
a
Out[4]: [[5, 0, 0], [5, 0, 0], [5, 0, 0]]
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