用户登陆程序（python3.x）

程序要求：
　  1.输入用户，如果没有注册，先注册

　　2.认证成功先是欢迎信息

　　3.输错三次后锁定

 1 username = input("username:")
 2 #判断用户被锁了
 3 with open("lock.txt",'r+') as l:
 4     lockname=l.readlines()
 5     if username in lockname:
 6         print ("you user is locked,you can not login,plese you go to  unlock...")
 7         exit()
 8     else:
 9         print ("you user unlock,plese next...")
10 
11 #判断用户是否注册，如果注册进行登陆，没有注册则进行注册
12 for i in range(2):
13     with open("register.txt",'r+') as f:
14         regname=f.readlines()
15         if username in regname:
16              print("your user have registed........plese logining...")
17              break
18         else:
19              print("this system have not your user,you must to regist....")
20              with open("passwd.txt",'r+') as p:
21                 reguser = input("reguser:")
22                 regpasswd= input("regpasswd:")
23                 f.writelines('\n')
24                 f.writelines(reguser)
25                 p.writelines('\n')
26                 p.writelines(regpasswd)
27 
28 #进行登陆
29 loginname=input("loginname:")   ##这个name与注册的是相同的
30 for i in range(3):
31     loginpasswd=input("loginpasswd:")
32     with open("passwd.txt",'r+') as w:
33          passwd=w.readlines()
34 
35          if loginpasswd in passwd:
36             print ("welcome to here....")
37             break
38          elif i<2:
39             print ("your passwd is false...plese try agin...")
40          else:
41             print ("you have tried three times,your user have locked")
42             #向锁文件添加用户
43             with open("lock.txt",'a+') as k:
44                 k.writelines('\n')
45                 k.writelines(loginname)