n = int(input())
chess =[[]]*n
for i in range(n) :
for j in range(n):
chess[i].append(0)
print(chess)
I want to make list as N x N. but this cord make list as N x (N^2). why is thlis list phenomenon?
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gunwoof
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Because `chess =[[]]*n` creates a list with *n references to the same list*. So *any* time you `chess[i].append(0)` you are appending *to the same list* – juanpa.arrivillaga Apr 16 '22 at 00:50
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You can just use `[[0 for _ in range(n)] for _ in range(n)]` – juanpa.arrivillaga Apr 16 '22 at 00:51