import hashlib
# 计算 MD5 口令
def calc_md5(password):
    md5 = hashlib.md5()
    md5.update(password.encode('utf-8'))
    return md5.hexdigest()
# 验证用户登录
def login(user, password):
    if user in db:
        return db[user] == calc_md5(password)
    else:
        return False