Python 3.6 list对比并输出差异

y t  2列数据对比，输出 T中的新增元素存放到txt文件中

# -*- coding:utf-8 -*-import osyesterdaynamelist=[]todaynamelist=[]differentnamelist=[]areceivername=[]test=[]#读取 昨天生成的namelist 文件 并生成todaynamelistnamelist = open('D:\\python\\Project\\AtuoEmail\\Date\\riqi.txt','r')linea = namelist.readlines()# lineb = namelist.readline()# print (namelist)# print (linea)# print (lineb)# for i in linea:#     print (i)#for i in linea:    line=i.split()    # print(line)    yesterdaynamelist.extend(line)    # print(yestdaynamelist)# 将todaynamelist 列表输出成单列的文本。yesterdaytxt = open("D:\\python\\Project\\AtuoEmail\\Date\\yesterdaytxt.txt","w",encoding="utf-8")  #w参数 创建+复写yesterdaytxt.close()for i in yesterdaynamelist:     # print (i)     # print(type(i))     yesterdaytxt = open("D:\\python\\Project\\AtuoEmail\\Date\\yesterdaytxt.txt","a",encoding="utf-8")     yesterdaytxt.write(i)     yesterdaytxt.write("\n")yesterdaytxt.close()# todaytxt.write(todaynamelist)# todaytxt.close()  #关闭文件# Yesterdaytxt# temp# print (line)# for i in line:#     print i.strip().split()[0]#     print i.strip().split()[1]#     print i.strip().split()[2]#调用 cmd生成当天最新的域控用户名单。os.system('D:\\python\\Project\\AtuoEmail\\TodayADUser.bat')namelist = open('D:\\python\\Project\\AtuoEmail\\Date\\riqi.txt','r')linea = namelist.readlines()todaynamelist=[]for i in linea:    line=i.split()    # print(line)    todaynamelist.extend(line)    # print(todaynamelist)# print(todaynamelist)# print(yesterdaynamelist)# print(list(set(todaynamelist).difference(set(yesterdaynamelist))))#生成差异名单并导出文件differentnamelist=list(set(todaynamelist).difference(set(yesterdaynamelist))) #“t”“y”对比，输出“T”中新增的元素# print(differentnamelist)for i in differentnamelist:#      print (i)#      print(type(i))      differentnamelist = open("D:\\python\\Project\\AtuoEmail\\Date\\differentnamelist.txt","a",encoding="utf-8")      differentnamelist.write(i)      differentnamelist.write("@dafy.com,")differentnamelist.close()