import os

user_file = open('use_file.txt', 'r')

user_list = user_file.readlines()

user_file.close()

while True:

    lock_file = open('lock_file.txt', 'r+')

    lock_list = lock_file.readlines()

    lock_file.close()

    login_Success = False

    user_name = input(('user:').strip())

    for line1 in lock_list:

        line1 = line1.split()

        if user_name == line1[0]:

            print("Sorry, you are already in the block list, get the fucking out!")

            exit()

    for line2 in user_list:

        line2 = line2.split()

        if user_name == line2[0]:

            for i in range(3):

                password = input(('Password:').strip())

                if password == line2[1]:

                    print("Welcome %s login my system!" % user_name)

                    login_Success = True

                    break

            else:

                f = open('lock_file.txt', 'a')

                f.write('%s\n' % user_name)

                f.close()

                print("Entered 3 times of wrong passwd, going to lock %s" % user_name)

            if login_Success == True:

                break

    if login_Success == True:

        break