python 實(shí)現(xiàn)把一維的序列循環(huán)賦值給二維的序列問題，求助a = [0,0,0,0]b = []for i in range(4):a[3] = ib.append(a)print b想實(shí)現(xiàn)的是：[[0, 0, 0, 0], [0, 0, 0, 1], [0, 0, 0, 2], [0, 0, 0, 3]]可是實(shí)際是：[[0, 0, 0, 3], [0, 0, 0, 3], [0, 0, 0, 3], [0, 0, 0, 3]]求問哪里有問題？