from copy import deepcopy a = [1, [2,3,4],5] b = a.copy() # b[0] = 0 # 输出 [1, [2, 3, 4], 5],不会影响a的结果 # b[1][0] = 1 # 输出 1, [1, 3, 4], 5],a的结果也发生的改变,copy函数不能嵌套拷贝,需要使用deepcopy函数才行。 # b[1][0] = [] # 输出 [1, [[], 3, 4], 5],a的结果也发生改变 # b[1][0:1] = 1 # 报错 TypeError: can only assign an iterable,b[1][0:1]返回是一个list类型,不能使用1 int类型给它赋值 # b[1][0:1] = [] # 输出 [1, [3, 4], 5] # b[1][1:2] = [] # 输出 [1, [2, 4], 5] # b[1][0:2] = [] # 输出 [1, [4], 5] # b[1][0:] = [] # 输出 [1, [], 5] b[1] = [1,2] # 输出 [1, [2, 3, 4], 5] # b[1][:] = [1,2] # 输出 [1, [1, 2], 5] # b[1][0:1] = [1,2] # 输出 [1, [1, 2, 3, 4], 5] print(a)
记录某次 python 的面试题,全程懵逼,python索引切片的原理,求个大佬指点下啊。