grid = [[0,]*5]*3
for i in range(3):
for j in range(5):
if (i+j+2)%2 ==1:
grid[i][j] = 1
print grid
结果成了下面这个样子,请教为何....
[[1, 1, 1, 1, 1], [1, 1, 1, 1, 1], [1, 1, 1, 1, 1]]
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