db = {    'michael': 'e10adc3949ba59abbe56e057f20f883e',    'bob': '878ef96e86145580c38c87f0410ad153',    'alice': '99b1c2188db85afee403b1536010c2c9'}def login(user, password):    md5 = hashlib.md5()    md5.update(password.encode('utf-8'))    if db[user] == md5.hexdigest():        return True    return False# 测试:assert login('michael', '123456')assert login('bob', 'abc999')assert login('alice', 'alice2008')assert not login('michael', '1234567')assert not login('bob', '123456')assert not login('alice', 'Alice2008')print('ok')

import hashlib, randomdef get_md5(s):    return hashlib.md5(s.encode('utf-8')).hexdigest()class User(object):    def __init__(self, username, password):        self.username = username        self.salt = ''.join([chr(random.randint(48, 122)) for i in range(20)])        self.password = get_md5(password + self.salt)db = {    'michael': User('michael', '123456'),    'bob': User('bob', 'abc999'),    'alice': User('alice', 'alice2008')}def login(username, password):    user = db[username]    return user.password == get_md5(password + user.salt)# 测试:assert login('michael', '123456')assert login('bob', 'abc999')assert login('alice', 'alice2008')assert not login('michael', '1234567')assert not login('bob', '123456')assert not login('alice', 'Alice2008')print('ok')