作業一：登陸認證
基礎需求：
讓用戶輸入用戶名密碼
認證成功後顯示歡迎信息
輸錯三次後退出程序

升級需求：
可以支持多個用戶登錄 (提示，通過列表存多個賬戶信息)
用戶3次認證失敗後，退出程序，再次啟動程序嘗試登錄時，還是鎖定狀態（提示:需把用戶鎖定的狀態存到文件裏）

初始版本：

 1 # -*- coding:utf-8 -*-
 2 # author: heimu
 3 
 4 import os
 5 
 6 user_dic = {"heimu_1":"111111","heimu_2":"222222","heimu_3":"333333"}
 7 lock_state = []
 
 8 count = 1
 9 if os.path.isfile("lock_state.txt"):
10     with open("lock_state.txt","r") as f:
11         lock_state = f.readline()
12 while count <= 3:
13     user_name_input = input("please input user name: ")
14     passwords_input = input("please input six digital passwords: ")
15     if user_name_input in
 
 lock_state:
16         print("Sorry,%s account has been locked" % user_name_input)
17         break
18     elif user_name_input in user_dic and user_dic[user_name_input] == passwords_input:
19         print("Welcome!%s" % user_name_input)
20         break
21     elif count < 3:
22         print("
 
Authentication failure! Please input again.")
23     else:
24         print("You have failed three times,the program is going to exit !!!")
25         if user_name_input in user_dic:
26             with open("lock_state.txt","a") as f:
27                 f.write(user_name_input)
28     count+=1

經過大王的悉心教誨之後的版本

 1 # -*- coding:utf-8 -*-
 2 # author: heimu
 3 
 4 import os
 5 
 6 user_dic = {"heimu_1":"111111","heimu_2":"222222","heimu_3":"333333"}
 7 lock_state = []         # 存儲黑名單
 8 count = 1
 9 first_input_user = None     # 記錄第一次輸入的賬戶名
10 is_same_user = True         # 標誌位，用於判斷三次輸入的用戶名是否相同
11 
12 if os.path.isfile("lock_state.txt"):        # 如果文件存在則打開文件
13     with open("lock_state.txt","r") as f:   # 使用with語句，省去了每次得手動關閉文件
14         for line in f:                      # 叠代f文件，line循環一次表示一行
15             lock_state.append(line.strip()) # .strip 表示取出空格換行符之類的
16 
17 # 主函數
18 while count <= 3:
19     user_name_input = input("please input user name: ")
20     passwords_input = input("please input six digital passwords: ")
21     if user_name_input in lock_state:       # 如果賬戶存在於黑名單，直接退出
22         exit("Sorry,%s account has been locked" % user_name_input)
23     if not first_input_user:                # 如果為None，代表為第一次輸入賬戶
24         first_input_user = user_name_input
25     if first_input_user != user_name_input: # 代表本次輸入的用戶名和第一次用戶名不一樣
26         is_same_user = False                # 標誌位設置為False，表示不再執行賬戶鎖定操作
27     if user_name_input in user_dic and user_dic[user_name_input] == passwords_input:
28         print("Welcome!%s" % user_name_input)   # 登陸成功
29         break
30     else:
31         print("Authentication failure! Please input again.")    # 失敗錯誤少於三次，打印認證失敗語句
32     count+=1
33 else:
34     print("You have failed three times,the program is going to exit !!!")
35     if is_same_user:        # 鎖定用戶
36         if user_name_input in user_dic:     # 如果賬戶名存在於文件中，把賬戶名加入黑名單
37             print("%s賬戶已經鎖定" % user_name_input)
38             with open("lock_state.txt","a") as f:
39                 f.write(user_name_input+‘\n‘)
40         else:
41             pass                            # 如果賬戶名不在文件中，就算重復三次也不加入黑名單

路飛學城14天集訓營作業1—登陸認證