python - 类型错误 : 'str' object does not support item assignment (Python)

Question

这就是我想要做的:

输入:ABCDEFG

期望的输出:

***DEFG
A***EFG
AB***FG
ABC***G
ABCD***

这是我写的代码:

def loop(input):
    output = input
    for index in range(0, len(input)-3):              #column length
        output[index:index +2] = '***'
        output[:index] = input[:index]
        output[index+4:] = input[index+4:]
        print output + '\n'

但我收到错误:TypeError: 'str' object does not support item assignment

Answer 1

您不能修改字符串的内容，您只能用更改创建一个新的字符串。所以你想要这样的东西而不是上面的函数

def loop(input):
    for index in range(0, len(input)-3):              #column length
        output = input[:index] + '***' + input[index+4:]
        print output