python实现vlookup功能：找出列表中不同的项

python实现vlookup功能：找出列表中不同的项

直接上代码，留着备用。

#!/usr/local/bin/pyhton
# -*- coding: utf-8 -*-
#从all.txt里把bad.txt里的行挑出来，再存为good.txt，起到了vlookup的作用

a_dict = {}
b_dict = {}

a_i = 1
for a_line in open('all.txt'):
	a_dict['%s'%(a_line.strip())] = a_i
	a_i += 1

#print a_dict

b_i = 1
for b_line in open('bad.txt'):
	b_dict['%s'%(b_line.strip())] = a_i
	b_i += 1

#print b_dict

f = open("good.txt","w")
for a1 in a_dict.keys():
	if a1 in b_dict.keys():
		pass
	else:
		print >>f,a1