27-字符串的排列.py

# -*- coding:utf-8 -*-
class Solution:
    def Permutation(self, ss):
        # write code here
        if not ss:
            return []
        if len(ss) == 1:
            return list(ss)
        
        charList = list(ss)
        charList.sort()
        pStr = []
        for i in range(0,len(charList)):
            if i > 0 and charList[i] == charList[i-1]: 
                continue
            temp = self.Permutation(''.join(charList[:i])+''.join(charList[i+1:]))
            for j in temp:
                pStr.append(charList[i] + j)
                
        return pStr