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[SOUND] So let's use our new found date
time abilities to make

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an app that will ask us math questions and
time our answers.

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We're gonna keep it pretty bare bones, but
that lets us leave a place or two for

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improvements.

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If you haven't watched object oriented
Python yet,

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you'll probably want to before this video,
so you won't be lost.

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All right.

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Ready?

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Let's get started.

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Okay.
So

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let's create a few classes that'll make it
easier for us to create and ask questions.

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Our app is just going to ask addition and
multiplication questions.

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So, our classes should be pretty simple.

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I'm doing this in a file called
questions.py.

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So let's make a class Question and it's
gonna have two attributes.

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Answer, which is None and text, which is
None.

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I'm actually going to leave the class
right there.

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You would think I'd add more, but I want
these to be very simple.

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I want them to have a very simple API and

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I don't want them to be crazily
overextended.

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You could definitely add some more to this
to make them simpler or

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to make them a little smarter if you want.

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That's completely up to you.

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So now let's make a class called Add and

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it's going to extend question and I'm
gonna override the init for it.

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And it's going to take two numbers and so

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we're gonna set self.text equal to this
string format and

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we're gonna stick in number one and number
two.

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And self.answer is going to be the actual
value of num1 plus num2.

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Okay.

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So let's do the same thing here for
multiply.

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In fact, I'm going to copy this and

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what we're going to do is we're going to
change this, I'm going to put in an x.

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You could use the time, the, the star, you
could use a unicode time.

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You can use the word times, whatever you
wanna do.

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So the only thing different here is how we
calculate stuff.

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I think this was pretty quick.

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I think this was worth it, but let's test
these out.

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So let's come down here to our workspace
and

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let's do from questions import Add.

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And we are going to do add1 equals Add and

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we are going to pass in numbers, so let's
do five and seven.

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Okay.

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If we look at add1.text, we get 5 plus 7.

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And if we look at add1.answer, we get 12,
which is right.

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That's pretty awesome.

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That's, that's what I wanted to do.

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So before we move on and wrap up this
video,

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let's actually go ahead and do our quiz.

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We'll do some planning on our quiz.

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So New File, we'll do quiz.py.

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At this point, well we're gonna have a
class.

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Right?

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And we're gonna want to be able to store
and

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hold onto all the questions that we have.

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So, our questions is gonna be an empty
list.

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Okay.

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So cool.

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But oh, wait.

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So, if we're gonna use questions, we're
gonna have to import them.

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So we need to do from questions import
Add, Multiply.

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So we've got both of those.

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We're also gonna wanna track how long it
takes to answer these things, so we need

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a start time and an end time and we're
gonna wanna build these things randomly.

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So that means, we're going to need to
import datetime and import random.

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So you notice that there's a blank line in
between datetime random and questions?

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That's because my local imports, I wanna
have this, this little bit of separation,

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just so I can see, like, okay, these are
top level right here.

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And these are my own custom ones right
here and so on.

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By top-level, I mean like built into the
standard library.

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You don't have to do this, but it's a good
habit.

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All right.

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So when we initialize our quiz, we're
gonna want to generate some question.

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Right?

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So let's, I don't know, we could probably
do that in def init.

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And so let's just say, generate 10 random

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questions with numbers from 1 to 10.

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And then we'll say, add these questions
into self.questions.

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Okay.

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Pretty simple.

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Let's add a new method here called
take_quiz.

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And I think this is gonna be the method
that actually, like asks the questions.

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So, let's see.

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Log the start time and ask all of the
questions.

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And log if they got the question right and

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log the end time and then show a summary.

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Okay.

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This makes me think that since we've got
this, this ask all the questions

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it makes me think that maybe we should
have a method that asks the questions.

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So let's call it maybe ask and it'll have
a question.

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But you know what?
Before we do that,

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we'll put a pass in there, just to let
these things pass.

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Let's go up here and add an answers list.

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And this would be what stores, whether or
not they got a given answer right.

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So we can go look, we can go okay.

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Question number six, which has the fifth
index and

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answer number six which again, has the
fifth index.

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What's the question and what's the was the
answer they gave true or false?

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And that way we can go, oh, you missed
question number five.

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Here it is again.

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Not something we're going to build, but
something you could add if you wanted to.

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Okay.

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So, ask, what are we going to do here?

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So, I think we should log the start time,
because it might be a neat stat to show.

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Again, not something I'm gonna write, but
something you might want to add to show

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how long it took them to answer each
question.

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So they can go, oh,

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multiplication questions take me longer
than addition questions or whatever.

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We want to capture the answer.

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[NOISE] We want to check the answer.

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We want to log the end time.

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So how long it took them to answer that
question?

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And then if the answer is right, send back
true.

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Otherwise, send back false and

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let's send back the elapsed time too.

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So that way, we've got back true or false
and we've got back, you know, oh,

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ten seconds or five milliseconds or, or
whatever.

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Okay.

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And then I think,

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the only thing we are missing is a we've
talked about having a way to show summary.

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So let's have a function that shows the
summary print or, sorry, a method print.

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Write how many you got right and the total
number of questions.

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So, you know, that'll be like five out of
ten and

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then print the total time for the quiz.

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So, you know, that'll be like 30 seconds.

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Okay.

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So, I think that gets us in a good spot
and we'll come back and

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build the rest next time.

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All right.

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Well, we have two good classes for asking
questions and quite a bit of planning.

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Feel free to try and finish the app from
here if you want.

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I'll show you my solution to it in the
next video.