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],
[0,1,0]]
myList = [([0] * 3) for i in range(4)]
避免浅拷贝。。。
原文：http://www.cnblogs.com/XDJjy/p/7152392.html