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Gather Information
6:42Let's kick out the information gathering stories for this project
Okay, so there's a new workspace
attached to this video, and I'd like for
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you to launch it.
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It has a single file in it
called masterticket.py.
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It's not trademarked, is it, masterticket?
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This file has a single constant defined,
TICKET_PRICE.
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$10, that's very reasonable.
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There's also a counter that is
called tickets_remaining, and
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it's been set up to have
100 tickets available.
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Now that's a pretty small and
intimate space.
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Let's say we grab
the first user story here,
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of as a User I should be shown
the number of tickets left remaining so
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I can understand
the importance of buying now.
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I'm gonna put that In Progress.
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So let's flip back over here.
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I'm gonna make a comment for us.
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So we want to output how
many tickets are remaining,
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using the tickets remaining using
the tickets_remaining variable.
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All right, we can do that.
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Here, I'll tell you what.
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I'll pause and
why don't you write this output statement.
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And after you get it, unpause me and
I'll show you my implementation.
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Are you ready?
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Pause me.
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Here's how I did it.
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So, I'm gonna print("There are {}, and
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I'm gonna use string formatting,
tickets remaining.".
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And I'm gonna format and
I pass in the tickets_remaining variable.
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Awesome, well let's flip to Trello.
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We've already got one done.
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This feels pretty amazing, doesn't it?
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Okay, so next step.
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Let's grab this personalized
experienced one.
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I should have a personalized experience so
that I'm welcomed by the brand.
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So I'm gonna move that to In Progress and
okay.
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So to personalize things,
we need to capture our user's name.
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We're gonna need to use it a bit to
make things seem personalized, right?
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So here,
let me make this comment here for us.
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Why is that indenting?
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You know why it's indenting?
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Look at this.
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Look what I forgot.
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You see how that's indenting there?
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What's missing?
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I forgot this.
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There we go.
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[SOUND] All, right, so
I'm going to make a comment.
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So we'll say, Gather the user's name and
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assign it to a new variable.
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Okay, you totally got this.
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Go ahead and pause me, and
after you get it, unpause me, and
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I'll show you how I did it.
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Ready, so here's what I did.
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I came in here and I said,
name = input("What is your name?
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And I left some spaces,
because we know how that feels.
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So we can't really personalize
anything cuz there's nothing here yet.
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So, let's flip back over to the tasks.
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Ooh, here's a good one.
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As a User I should be able to request
a certain amount of tickets and be told
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the total costs so that I could determine
if I want to purchase the tickets.
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We can totally use this
personalization in the prompt.
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That sounds good.
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Let's do that.
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Okay, so let's see.
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We've got three steps here, right?
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So we've got Prompt the user by name and
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ask how many tickets they would like.
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Sounds good, so personalizing it.
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We'll say, hey, Bob.
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How many tickets would you like?
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And then we'll need to
do some calculation.
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So we'll calculate the price.
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What is that?
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That would be the number
of tickets that they want,
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right, multiplied by the price.
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And you should use that ticket
price variable up there.
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And then we will assign
that to a variable.
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And then finally,
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I think we just need enough to
output the price to the screen for
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this story to be done, so
we'll say Output the price to the screen.
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Okay, so there's three tasks there.
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I want you to take them nice and slow.
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You can totally do this.
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If you get stuck along the way, I invite
you to hit up your teammates who are also
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working through this in the community.
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And you can also unpause me and
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I'll give you a warning before
I start the other ones.
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Ready, you got this.
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Pause me.
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Okay so the first thing that
I did was I got num_tickets
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= input("How many tickets would you like,
and
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then I'm gonna put the place
holder with their name in here.
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And then, a couple spaces.
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And let's go ahead an do format, and
then we'll push the name in, okay?
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Close that paren off, awesome.
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Now to calculate the price, and
this might had been tricky,
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this might have caught some of you.
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We first need to make sure
that we have an integer.
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So what I did was I
reassigned num_tickets, so
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I said num_tickets = int(num_tickets).
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So now we have an integer in num_tickets,
is reassigned.
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Okay, and then I calculated the price.
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And that was amount_due.
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And that's equal to
the num_tickets * TICKET_PRICE.
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Okay, how'd you do?
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Hope that coercion didn't trip you up.
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Okay, and finally I output the total
again, using the format method on strings.
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And it doesn't matter that
amount due is an integer,
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it automatically coerces
it to a string for us.
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So, print("The total due is.
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So this is what mine
looks like when it runs.
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Does yours work?
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Let's see, we'll say python masterticket.
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My name is Craig, and
I would like to buy three tickets.
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Total due is 30 bucks, awesome!
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Is yours working, too?
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So let's flip over to Trello,
and we've got both of these done.
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That's a personalized experience.
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We got to remember to keep doing that.
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They seemed really keen on that.
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And they are also able to request
a certain amount of questions, and
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we got told the total cost.
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We are cruising along.
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Let's tackle the next few user
stories right after this quick break.
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