190327 Python登录接口

 1 #！Author:John
 2 # _*_ coding: utf-8 _*_
 3 #编写登录接口
 4 #输入用户名密码
 5 #认证成功后显示欢迎信息
 6 #输错三次后锁定
 7 import sys, os, getpass
 8 
 9 
10 limit = 3
11 count = 0
12 account_file = "account.txt"
13 lock_file = "locked.txt"
14 
15 while count < limit:
16     username = input("Please input username:")
17     # 打开文件后第一步输入用户名，打开lock文件，检查改用户是否已经被锁定
18 
19     f1 = open(lock_file,‘r‘)
20     # r后面不能加b，加b是以bytes类型打开，输入的用户名、密码是字符串str和bytes不匹配
21     for line in f1.readlines():
22         if username == line.strip():
23             sys.exit("User %s has been locked!"%username)
24     f1.close()
25     password = input("Please input password:")
26 
27     f = open(account_file, ‘r‘)
28     match_flag = False
29     for line in f.readlines():
30         user,pwd=line.strip().split()   # 这里的知识点需要掌握
31         if user==username and pwd == password:
32             print(username,"has match successfully!")
33             match_flag=True
34             break
35     f.close()
36     if match_flag==False:
37         print("Username or password is incorrect!")
38         count+=1
39     else:
40         print("Welcome login Python Learning system!")
41         break
42 else:
43     print("Your account has been locked!")
44     f1=open(lock_file,"a")
45     f1.write(username+‘\n‘)
46     f1.close()