def trim(s): if len(s) == 0 : return s elif s[0] ==" ": s = trim(s[1:]) elif s[-1] == " ": s = trim(s[:-1]) return s
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易烊千玺打call的小号
def trim(s):
if len(s) == 0 : return s elif s[0] ==" ": s = trim(s[1:]) elif s[-1] == " ": s = trim(s[:-1]) return s