Python3.0 simulates user logon, three error locks, and python3.0 User Logon

Python3.0 simulates user logon, three error locks, and python3.0 User Logon
# -*- coding:utf-8 -*-# Simulate user logon as required. login is not allowed due to more than three error lockscount = 0 #realname passwdReal_Username = "test"Real_Password = "test" # Read contents from the blacklistf = open('black_user','r')lock_file = f.read()f.close() Username = input('Enter the User name :') # Determine whether the user is in the blacklist. If the user is in the blacklist, the password cannot be entered.for i in range(1):    if lock_file == Username:        print('Sorry, your user is locked and cannot be used now! ')        exit()    else:        continue # Try to enter the password and count the number of inputsfor i in range(3):    Password = input("Enter the password :")    if Username == Real_Username and Password == Real_Password:        print("Logon successful")        break    else:        print("Logon Failed")    count += 1 # If three wrong passwords are entered, the system prompts that the user name is locked and the user name is blacklisted.if count == 3:    print("Sorry, the number of wrong passwords you entered has reached 3, and your user name will be locked")    f = open("black_user","w")    f.write("%s"%Username)    f.close()