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Welcome back.

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Let's finish off this section of a simple project exercise for this project you'll create a very simple

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username requirements check Web site.

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Basically a user is going to type out a user name into a form hit submit and then the flask application

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is going to grab that user name in the backend and it's good check to see if the user name passes through

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your requirements.

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So just like in our earlier example where we grab the first name and last name of the people that wanted

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to audition for that puppy rock band.

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We didn't actually do any checks on them so we just sent them to another thank you page where you're

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going to do now is grab the username do a little bit of check on it and then provide some more information

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to the report page.

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So the requirements here for the username that the user actually enters into the form is that the user

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name must contain a lowercase letter.

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It must contain an uppercase letter and it must end in a number.

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There are essentially a infinite number of ways you could check this with Python.

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So it's really up to you how you check these requirements inside your py file.

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But these are the pharmacy are going to have to check for with the user name is provided in that form.

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So if you grab that username in the form you're going to have some Python code logic that checks to

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see if these conditions are met and then you can have three template to files.

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One is a base HTL file that has a nav bar of Home link.

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The second is your index page which is essentially just going to have the simple form that redirects

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to a report page upon hitting submit that username and then the report page is going to indicate whether

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or not the username passed requirements.

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So let's go ahead and see what this page would look like in action.

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All right so this is what the web application should look like.

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Notice here I have a nav bar.

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That's coming from that base h him Al file and I have a little bit of information here welcome to the

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puppy user name check.

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Let's see if your username is secure and I ask you to fill out the form below a fuse name that has these

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three restraints has to have an uppercase letter somewhere.

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A lower case letters somewhere and then it must have a number at the end.

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So here you have a very simple form which is labeled username and LOYN to enter a user name.

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Let's provide one that we know is going to pass.

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So I'll start with capital E will say Eddie one then we get to the report page where it says Let's see

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how you perform.

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And it looks like the user name did pass the three requirements which makes sense because we had a capital

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letter and then a number at the end of some lower case letters as well.

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Let's go back to home page.

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And now let's do one that we know is not going to pass.

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So if I just say rufous and all lowercase are going to hit submit and it says oh looks like you have

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some issues of your username so I didn't have an uppercase character and I did not enter a username

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with a number.

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So inside of your template you're going to have some bits of logic to report back whether or not you

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had a success.

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And you also want to report back what failures there were so notice here.

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It might make sense to pass in a bunch of conditioned checks and then use that template control flow

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in order to print out what worked and what didn't work.

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As far as the requirements go we're essentially combining everything we just talked about here in your

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templates lectures to actually finish off this project.

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Now as far as approaching this project if you're feeling a little more ambitious go ahead and just go

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for it.

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Try it if you can do it on your own completely.

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If you want a little bit of guidance we have some skeleton code available for you inside of our templates

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folder.

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And if you are feeling a little uneasy with combining all these steps that's absolutely no problem but

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you can do is head on over to the next lecture and treat it as a code along solution lecture.

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Really it's up to you whatever approach you feel more comfortable with and another approach you can

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do is watch the solutions lecture and then see if you can do it all on your own.

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That's another great approach for people who are learning and just starting out a flask.

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All right.

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Best of luck on this project exercise.

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We'll see you in the next lecture where we start going over the solutions.