1、 while s[:1] == ' ': s = s[1:] while s[-1:] == ' ': s = s[:-1] return s 2、 def trim(s): if s == '': return s while s[0]==' ' and len(s)>1: s=s[1:] while s[-1]==' 'and len(s)>1: s=s[:-1] if s == ' ': return '' return s
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1、 while s[:1] == ' ': s = s[1:] while s[-1:] == ' ': s = s[:-1] return s 2、 def trim(s): if s == '': return s while s[0]==' ' and len(s)>1: s=s[1:] while s[-1]==' 'and len(s)>1: s=s[:-1] if s == ' ': return '' return s