User login 2

"""  Write user login interface : 1、 Enter the account password to complete the verification , Output after verification " Login successful " 2、 You can log in to different users  3、 The same account is locked three times by mistake  （ Tips ： The locked user is stored in the file , This ensures that after the program is closed , The user is still locked ） """

""" information Account information in the file ： jack:123456:0 word:123:0 hello:123:0 """

import os

flag = True
while flag:
    username = input(" Please enter your user name (q or Q sign out )：").strip()
    if username.upper() == 'Q':
        flag = False
        break
    #  from information Read the user's account in the file 、 Password information 
    with open('information', encoding='utf-8', mode='r') as f,\
            open('infor_copy', encoding='utf-8', mode='w') as ff:
        for line in f:
            #  Note that line breaks are removed , It's cutting 
            user, pwd, nums = line.strip().split(":")
            nums = int(nums)
            #  First verify whether the entered account exists 
            if username == user:
                #  If the user exists , Three chances to enter the password 
                while nums < 3:
                    password = input(" Please enter your password ：").strip()
                    if password == pwd:
                        print(f" Login successful , welcome {
      username}")
                        flag = False
                        break
                    else:
                        nums += 1
                        print(" I'm sorry , The password you entered is wrong , Please re-enter ！")
                #  Wrong input 3 Time , Prompt that the account has been locked 
                if nums == 3:
                    print('sorry, The account has been locked ！')
            #  Write unmodified and modified user data to infor_copy file 
            ff.write(f'{
      user}:{
      pwd}:{
      nums}\n')
    #  Delete information file 
    os.remove('information')
    #  Rename the modified file to the source file information
    os.rename('infor_copy', 'information')