去除重复字符串并保持原来顺序输出

#!/usr/bin/env python

# -*- coding: utf-8 -*-

a = "aAsmr3idd4bgs7Dlsf9eAF"

set_list = list(set(a))

set_list.sort(key=a.index)

print "".join(set_list)

a = "aAsmr3idd4bgs7Dlsf9eAF"

list1 = list(a)

set_list = list(set(list1))

set_list.sort(key=list1.index)

print "".join(set_list)