python序列成员资格

可以用做登录操作，判断用户名密码是否正确！

代码示例：

database = [
    ['albert',''],
    ['dilbert',''],
    ['smith',''],
    ['jones','']
]
username = input("UserName: ")
pin = input("PIN Code: ")
if [username,pin] in database:
    print("Access granted")
else:
    print("Access Refused")
    exit()

输出：

UserName: albert
PIN Code: 1234
Access granted

Process finished with exit code 0

UserName: albert
PIN Code: 2345
Access Refused

Process finished with exit code 0