用户登录三次，禁止登录

 1 def menu():
 2     #用户交互界面
 3     user_name = input("请输入在用户名：")
 4     password = input("请输入密码：")
 5     return user_name,password    #以元组形式返回值
 6 ‘‘‘
 7     alex  1314
 8     ryan  6238
 9     egon  1234
10 ‘‘‘
11 def write():
12     #将用户名、密码和登录次数在文件中写成字典的格式
13     user_name_password= {}#设置一个空字典装用户名、密码和登录次数
14     with open("test", encoding="utf8") as date, open("test2", encoding="utf8", mode="w") as revise:
15         for line in date:
16             line1 = line.strip().split()  #以空格分隔后是列表形式
17             user_name_password.setdefault(line1[0],[line1[1],0])#key值为用户名，value值为[密码，登录次数]
18         user_name_password = str(user_name_password)    #将字典转换成字符串
19         revise.write(user_name_password)   #将字典转换成的字符串写入文件test2
20
21
22 def main():
23     write() #
24     while True:
25         res = menu()#用户名和密码输入，返回值为元组形式（用户名，密码）
26         with open("test2",encoding="utf8") as date:
27             user_name_password = {}  #创建一个空字典，接收用户、密码和登录次数的的数据
28             for line in date:
29                 user_name_password = eval(line) #将用户、密码和登录次数数据转化为字典
30             if res[0] in user_name_password and user_name_password[res[0]][1] == 3:
31                 #文件中登录名已记录三次，禁止登录
32                 print("登录次数过多锁定")
33                 break
34             if res[0] in user_name_password and res[1] in user_name_password[res[0]][0] and user_name_password[res[0]][1] < 3:
35                 #用户、密码匹配成功和登录次数小于三次，登录成功
36                 print("successful")
37                 break
38             if res[0] in user_name_password and res[1] not in user_name_password[res[0]][0]:
39                 #用户匹配，密码不匹配，拉入黑名单，登录次数+1
40                 user_name_password[res[0]][1]=user_name_password[res[0]][1]+1    #登录次数+1
41                 user_name_password.setdefault(res[0],user_name_password[res[0]][1])  #将字典中登录次数的信息进行修改
42                 user_name_password = str(user_name_password)   #将字典转换成字符串
43                 with open("test3", encoding="utf8", mode="w") as revise:
44                     revise.write(user_name_password)  #匹配不成功，将信息写入文件
45                 date.close()   #改文件名需关闭文件
46                 revise.close() #关闭文件需关闭文件
47                 import os
48                 os.rename("test2", "test_bak")
49                 os.rename("test3", "test2")
50                 os.remove("test_bak")  #删除费文件
51                 print("用户名或者密码错误，请重新输入")
52             else:
53                 print("用户名或者密码错误，请重新输入")
54 main()