T1
def login(user, password):
    import hashlib
    md5 = hashlib.md5()
    md5.update(password.encode('utf-8'))
    if md5.hexdigest() == db[user]:
        return True
    return False

T2
def login(username, password):
    user = db[username]
    return user.password == get_md5(password + user.salt)