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Welcome to the final part of our assignment.

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And that is to now create the actual authentication system

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that will prompt the user to either register,

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log in or maybe just even exit the system.

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Now, what I'm going to do, first of all is I'm gonna remove the functions in here,

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register and log in.

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And I'm also going to remove the

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while loop right here because we're going to run that in a different location.

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And now I am going to

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change the identation

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and make sure that the

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uh functions, register user and login user are on the same line.

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This right here should be under

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the Loginuser function and there it is. OK?

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So

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let us begin by creating the

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authentication system. So I'm going to add my notes and call this one,

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the main menu.

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OK? And then we can define

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are functioning here, authentication underscore system.

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OK?

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And there it is. All right. So what do we need here?

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We need to prompt the user

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to either register, log in or exit.

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So we're going to print out a couple of statements. OK? So

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let us begin by printing out

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and I'm going to say

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uh let's say basic authentication system.

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Ok.

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This will be at the very top.

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And then next, let us print out the very first option for the user.

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So we can say one dot

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register

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will be the first option,

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ok?

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And then print

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option number two.

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So this will be two dot log

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in.

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Ok. And then the final option in here

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would be three and then that's let's call that one exit.

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OK?

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And there it is. So we've got our three options in here.

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Now,

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the user will have to

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add either 12 or three.

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So let us create a variable that will represent that particular option. So

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I'm going to call this one option.

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OK? So option is going to be equal to input.

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And now let us ask the user

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enter your choice.

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OK?

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So we're asking the user right now, hey, provide us with

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what you want to do.

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So we're gonna have to create the if else if scenario where

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we'll check to see if the user chooses option one, which is register,

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we can call the register user function.

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If they choose option two, we can call the login user function or if they exit,

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we can simply end the loop.

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So

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I am going to say right now

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that

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if

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option

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right here equals

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and now I can say one

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call on

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what do we do if this choose

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option one, well, we can call the function register underscore user.

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OK? Very, very straightforward.

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Now, LS F which is gonna be LF if it was option

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two,

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what are we gonna do?

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We are going to call the function login underscore user.

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And now

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for the last one,

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option

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uh equals

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three,

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what do we do?

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We can print

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and then in code we can say, exiting the system.

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OK?

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And

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there it is. And then we can say else

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if the user

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maybe provides option 456, which don't exist,

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then we can say else print

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and then in brackets, we can say

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invalid choice.

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And then we can say, please choose from

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options

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12 or three.

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And there it is.

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And there it is.

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And now finally,

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we can warn the authentication system,

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we can do this by simply saying authentication system.

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And there it is.

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So

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there is one thing

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that we haven't added just yet. I don't know if you can spot what it is,

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but that is the loop

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because right now as it is, it will this program will run just once.

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But we want the user to keep on either logging in or registering or exiting.

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So what do we do?

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This is where we will have to call in the while, while true loop.

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But where do you think we're gonna put it?

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We are going to put it just underneath

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our authentication system function. OK? So

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here is where I'm going to say while true.

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And now remember everything in here

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will have to fall under

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the while true statement. So

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make sure your identation is correct.

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And then we're going to have to add the break statement as well to end the loop.

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Now, where are we going to end the loop? We'll end the loop

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where the user chooses option three, which is to exit the system.

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So just underneath in here,

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underneath print, I'm going to say break

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and

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there it is our program hopefully should work without any issues.

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Let me go ahead right now and run it

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and ok, so we do have

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an issue right here

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and that's because

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the break. Oh, the break is outside the loop and look at that.

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Oh, wow. I

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indentation is so important. You can see right now that if all of this

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is in the same indentation as the while statement. So

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yeah, let us go back over here

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and indent them properly and there it is, you can see even I,

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I make mistakes with my identation as well.

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So

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let's make sure that everything else is indented properly.

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Ok? All right. Let's try running the program one more time. Ok.

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Thankfully, it works now. So

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let us test it out case I'm gonna go with option number one. First of all,

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let us register mark

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and his password is admin

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Awesome. Now let us try going to option number two

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to log in.

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Ok. So user name, let's try Nancy as an example password, let's say Bob.

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But now it says invalid name, username, password. Please try again. So

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it's obviously working really well. So let's try again to register

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this time as Mac

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once again and check to see if the program will detect that Mac already exists.

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So Mark

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and it says, ok, user

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already exists. Please choose a different username. Ok.

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Let us try logging in this time

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as mark.

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OK, analyst provide the password which is admin and it says, welcome back.

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It actually worked.

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Let us try to login in again as Mark.

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But this time let us use a different password,

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a long password and then it says invalid username and password.

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Please try again.

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So it appears it is working properly. The final test is to exit, enter

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and there you go,

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exit in the system. The loop has ended,

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the program has ended. So there it is, we have successfully created

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our program,

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which is a basic authentication system

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that would allow a user to either register log in or simply exit the program.

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And of course,

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we've added checks to ensure that no duplicate accounts can be registered.

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We've also added checks to ensure that the usernames and passwords will match.

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And there it is. Congratulations. I hope you enjoyed this assignment.

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This challenge.

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Thank you for watching. I will see you in the next class.