def strim(s): while s!="" and s[0]==" ": s = s[1:] while s!="" and s[-1]==" ": s = s[:-1] return s
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程序员_小迪
def strim(s): while s!="" and s[0]==" ": s = s[1:] while s!="" and s[-1]==" ": s = s[:-1] return s