>>> def trim(s):
... if len(s)==0:
... return s
... else:
... while s[0]==' ':
... s=s[1:]
... while s[-1]==' ':
... s=s[0:-1]
... return s
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时间：2020-09-28 07:03:33
>>> def trim(s):
... if len(s)==0:
... return s
... else:
... while s[0]==' ':
... s=s[1:]
... while s[-1]==' ':
... s=s[0:-1]
... return s
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![[廖雪峰python教程切片练习题]利用切片操作 实现一个trim()函数 去除字符串首尾的空](https://900zi.500zi.com/uploadfile/img/15/349/4b10cd37269ab72796ab32c437c9e54e.jpg)
