JavaScript字符串删除重复字符的方法

function dropRepeat(str){ var result=[]; var hash={}; for(var i=0, elem; i<str.length;i++){  elem=str[i];  if(!hash[elem]){   hash[elem]=true;   result=result+elem;  } } return result;}

dropRepeat("abcdd") 

python 2.7：#-*- encoding:utf-8 -*-string = 'abc123456ab2s'r = ''.join(x for i, x in enumerate(string) if string.index(x) == i)print stringprint r