# -*- coding:utf-8 -*-#需求模擬用戶登錄，超過三次錯誤鎖定不允許登陸count = 0#realname passwdReal_Username = "test"Real_Password = "test"#讀取黑名單的內容f = open('black_user','r')lock_file = f.read()f.close()Username = input('請輸入用戶名:')#判斷輸入用戶是否在黑名單內，如果在則不允許輸入密碼for i in range(1):  if lock_file == Username:    print('對不起，您的用戶已鎖定，暫時不允許使用！')    exit()  else:    continue#嘗試輸入密碼并對輸入次數進行計數for i in range(3):  Password = input("請輸入密碼:")  if Username == Real_Username and Password == Real_Password:    print("登錄成功")    break  else:    print("登錄失敗")  count += 1#如果輸入三次錯誤密碼，則提示用戶名鎖定，并將用戶名拉黑if count == 3:  print("對不起，您輸入的密碼錯誤次數已經達到3次，您的用戶名將被鎖定")  f = open("black_user","w")  f.write("%s"%Username)  f.close()