import hashlib

#练习1
def calc_md5(password):
    md5 = hashlib.md5()
    md5.update(password.encode('utf-8'))
    return md5.hexdigest()

def login(user, password):
    return db[user] == calc_md5(password)

#练习2
db = {}
def get_md5(password):
    md5 = hashlib.md5()
    md5.update(password.encode('utf-8'))
    return md5.hexdigest()
def register(username, password):
    db[username] = get_md5(password + username + 'the_Salt')
def login(username, password):
    return db[username] == get_md5( password + username + 'the_Salt')