def Judge(s): i = 0 while(i<len(s)): if(s[i]!=' '): return 1 i = i+1 return 0
def trim(s): if Judge(s)==0: print('Nothing') return None else: if s[0]==' ': return trim(s[1:]) elif s[-1]==' ': return trim(s[:-1]) else: return s
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冒泡的大狸猫
def Judge(s): i = 0 while(i<len(s)): if(s[i]!=' '): return 1 i = i+1 return 0
def trim(s): if Judge(s)==0: print('Nothing') return None else: if s[0]==' ': return trim(s[1:]) elif s[-1]==' ': return trim(s[:-1]) else: return s