Использование словаря для регистрации пользователей

users_passwords = {
    'guest01': '1111',
    'rim41': "I_am_a_good_boy",
    'guest67034' : 'qwerty'
}
act = input()
if act == 'register':
    new_user_login = input('Print the login: ')
    new_user_key = input('Print the password: ')
 
    if new_user_key.count('la') >= 3 or new_user_key == 'qwerty' or new_user_key == 'password' or len(new_user_key) <= 3 or new_user_key == new_user_login or new_user_login in users_passwords:
        print('Error: your password is not secure enough, or your username is being used by another user')
    else:
        users_passwords[new_user_login] = new_user_key
        print('The register was good!')
        print('new list - ', users_passwords)
if act == 'log in':
    user_login = input('Print your login: ')
    if user_login in users_passwords:
        user_password = input('Print your password: ')
        #тут должно быть условие, в котором говориться: если значение ключа user_login является user_password, print('Hello, ', user_login)
        #в else: print('Your password is not right!)
    else:
        print('You are not registered. Sign up below to continue')

if user_login in users_passwords.keys():
    user_password = input('Print your password: ')
    if users_passwords[user_login] = user_password:
        print('Hello, ', user_login)
    else: print('Your password is not right!)

users_passwords.update(new_user_login=new_user_key)