Python write simple user login system

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topic:

1. There are multiple users in the system, and the user's information is currently stored in the list.
users=['root','westos']
passward=['123','456']

2. User login (determine whether the user login is successful

• Determine whether the user exists
• if it exists

(1). Judge whether the user password is correct

 如果正确，登陆成功，退出循环
 如果密码不正确，重新登录，一共有三次机会登录

• If the user does not exist

  重新登录，一共有三次机会登录
  

The demo code is as follows:

users=['root','westos']
passward=['123','456']

n=0
while n<3:
    user=input('users:')
    n+=1
    if(user in users):
        index=users.index(user) #用index方法取出输入users的位置
        passw=input('passward:')
        passw1=passward[index] #将index值返回在passward中
        if(passw==passw1):
            print("login success")
            break
        else:
            print("passward wrong,please relogin")
    else:
        print("users wrong,please relogin")

else:
    print("Three login opportunities are exhausted")

operation result: