def trim(s): while s[:1] == ' ': s = s[1:] while s[-1:] == ' ': s = s[:-1] return s s = input('请输入一个单词') print(trim(s))
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def trim(s): while s[:1] == ' ': s = s[1:] while s[-1:] == ' ': s = s[:-1] return s s = input('请输入一个单词') print(trim(s))