#-*- coding: utf-8 -*-

import hashlib

db = {}

def calc_md5(passward):
    md5 = hashlib.md5()
    md5.update(passward.encode('utf-8'))
    return md5.hexdigest()

def register(username, passward):

    db[username] = calc_md5(passward + username + 'the-salt')
    print('Register successfuly!\nYou can login')

def login(user, passward):
    user = input('Your username: ')
    passward = input('Your passward: ')    
    if user in db:
        if calc_md5(passward + user + 'the-salt') == db[user]:    
            print('%s login successfully' %user)
        else:
            print('Passward incorrect!, Please try again')

    else:
        print('%s doesn\'t exist'%user)

if __name__ == '__main__':
    user = input('You want name: ')
    passward = input('You want passward: ')
    register(user, passward)    
    login(user, passward)