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1.保持a不动,动bcd
2.保持b不动,动cd
3.保持c不动,动d
def pailie(head="",string=""): if len(string)>1: for father_string in string: pailie(head+father_string,string.replace(father_string,"")) #关键一点:将头和尾全部传下去 else: print(head+string) pailie(string="abcd")
def pailie(head="",string=""): if len(string)>1: for num,father_string in enumerate(string): if father_string in string[0:num]:#如果字符与前面的重复说明拍过顺序了 continue pailie(head+father_string,string.replace(father_string,"",1))#只能替换一次 else: print(head+string) pailie(string="abca")
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