喜欢这个解法

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#1 Created at ... [Delete] [Delete and Lock User]

def trim(s):
    if len(s) != 0:
        while s[:1] == ' ':
            s = s[1:]
        while s[-1:] == ' ':
            s = s[:-1]
    return s

#2 Created at ... [Delete] [Delete and Lock User]

请问：

def trim(s):    if len(s) != 0:        while s[0] == ' ':            s = s[1:]        while s[-1] == ' ':            s = s[:-1]    return  s

为什么就会显示错误

#3 Created at ... [Delete] [Delete and Lock User]

然而我用了你这个，结果是对的

#4 Created at ... [Delete] [Delete and Lock User]

while s[:1]==' ':

s=s[1:]

while s[-1:]==' ':

s=s[:-1]

return s

#5 Created at ... [Delete] [Delete and Lock User]

因为你用while s[0] == '空格'，下一行是s =s[1:]，而如果输入的s是只含一个空格的字符是无法进行s[1:]切片的，所以机器会报错。