myList
=
[[
0
]
*
3
4
但是当操作myList[0][1] = 1时，发现整个第二列都被赋值，变成
[[0,1,0],
[0,1,0],
[0,1,0]]
myList = [([0] * 3) for i in range(4)]
[([
)
for
i
in
range
(
)]
避免浅拷贝。。。