def trim(s): length = len(s) startindex = 0 endindex = length while startindex < length: if s[startindex] != ' ': break else: startindex = startindex + 1 while endindex > startindex: if s[endindex - 1] != ' ': break else: endindex = endindex - 1 return s[startindex:endindex]
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倔强的leter
def trim(s): length = len(s) startindex = 0 endindex = length while startindex < length: if s[startindex] != ' ': break else: startindex = startindex + 1 while endindex > startindex: if s[endindex - 1] != ' ': break else: endindex = endindex - 1 return s[startindex:endindex]