# -*- coding: utf-8 -*- def trim(s): if s=='': return s else: while s[:1]==' ': #用s[:1]代替s[0]可以避免s为空集而索引超出出错的情况; s=trim(s[1:]) while s[-1:]==' ': #用s[-1:]代替s[-1]可以避免s为空集而索引超出出错的情况; s=trim(s[:-1]) return s
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状元刚01