这里的思路是截掉两边的 ' '
if len(s) == 0: return '' left = 0 for i in range(0, len(s)): if s[i] == ' ': left = left + 1 else: break s = s[left:] right = len(s) for i in range(0, len(s)): i = (i + 1) * -1 if s[i] == ' ': right = right - 1 else: break return s[0:right]
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menfrexu
这里的思路是截掉两边的 ' '