# 輸入用戶名密碼
 # 認證成功后顯示歡迎信息
 # 連續(xù)輸錯三次后鎖定
count = 0
while True:
  #輸入用戶名密碼
  username = input("Username:")
  password = input("Password:")
  #打開用戶名密碼文件
  f = open('login_true.txt')
  #打開鎖定用戶名文件
  f4 = open('login_lock.txt')
  #判斷輸入用戶名是否存在于鎖定文件中
  for line in f4:
    user_name2 = line.strip()
    if username == user_name2:
      print("username is locked!")
      break
  else:
    #判斷用戶名密碼是否正確
    for line in f:
      str = line.strip()
      str2 = ','
      user_name = str[:str.index(str2)]
      pass_word = str[str.index(str2)+1:]
      # print(user_name, pass_word)
      #用戶名密碼均正確，打印歡迎信息并清空計數(shù)器跳出循環(huán)
      if username == user_name and password == pass_word:
        print("welcome " + username)
        count = 0
        break
      #用戶名正確，密碼錯誤，打印提示信息，計數(shù)器加1，并判斷計數(shù)器是否到3
      elif username == user_name and password != pass_word:
        print("wrong password!")
        count += 1
        print(count)
        #計數(shù)器到達3次，將用戶名寫入鎖定文件中
        if count == 3:
          f2 = open('login_lock.txt', "a+")
          f2.write(username+'\n')
          f2.close()
          count = 0

        break
    else:
      print("please check out your username!")
      count = 0
    f.close()