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- [Instructor] Once you create

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your Twitter developer account,

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you will need to get credentials

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that you can use to
authenticate with Twitter

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before you can actually
make web service calls

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to the various APIs that
are available to you.

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So what you're going to do

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in order to get those credentials

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is what they call creating an app

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and every app you create

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through the developer portal at Twitter

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is going to have its
own separate credentials

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so you can create as many
different apps as you like.

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Let me switch over to the developer portal

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so you'll need to log in

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with your Twitter Developer Account.

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I'm logged in with ours right now

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which is our Deitel Twitter account

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and in the drop down menu for our account

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that there's an apps option here.

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This is where you'll create your app.

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Now in my case I've already
created a couple of apps.

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The one that I'm using for this lesson

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is called DeitelTest1

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and I'll come back to that momentarily.

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You're going to have
to click create an app

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and once you do you'll have to
fill in the required details.

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So you need to give your app a name

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that's going to be used
for example if the app

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sends tweets as the sender

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or if the app requires a user to log in

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with their own Twitter credentials,

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this will display the
app's name to the user

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so that they know what app is
requiring those credentials

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in the first place.

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You must give between
ten and 200 characters

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of application description information

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so for us we just said
that we're learning to use

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the Twitter API's.

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You must supply the
website URL for your app

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and since we're not
actually creating an app

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to go and distribute,

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we're just demonstrating capabilities

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we used our twitter.com URL

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which is simply twitter.com/
and whatever your user name is

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in our case Deitel.

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The other information here is not required

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for what we're going to do in this lesson

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but if you're creating real apps

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you're often going to need
to fill in some or all

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of this information that you
see on the screen right now.

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And then finally at the very bottom here

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you must fill in a
minimum of 100 characters

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explaining what the purpose is of your app

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in terms of how it's going to be used

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and for our purpose we
literally just wrote

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I am new to Twitter app development

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and am simply learning how
to use the Twitter API's

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for educational purposes.

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Now once you fill in
the required information

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you'll click the create button.

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At that point you'll be taken to a page

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where you have to agree to the terms

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and if you do agree to those terms

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you'll click create to
actually create your app.

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And you can't use the services

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until you agree to the terms

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so just make sure you check
out those terms carefully.

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Now once you click create the second time

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you'll be taken to a page
where you can manage the app

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that you just created.

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So in my case let me just
go to the page for the app

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I already have created here.

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So that's my DeitelTest1 app.

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And it'll look like this
at least at the moment

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and the important tab for
what you're going to need

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for your login credentials

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is Keys and tokens.

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Now I can't show you
my Keys and tokens tab

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because it has my unique
key and token information

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that I need to login with my account

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and if I give that out to everybody else

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then I will probably go past
all of the Twitter rate limits

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that you are required to adhere to

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and I could lose my developer account.

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But you're going to click that tab

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and on that tab you'll see that
there's already information

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for your so-called consumer API keys.

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And there's two pieces
to that information.

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There's an API key and an API secret key

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and you'll need both of those

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so you may wanna copy
them down and in fact

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you'll want to copy them
from the page Keys and tokens

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into a file that I'm going
to show you in just a moment.

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But separately there's
going to be another section

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to that page and in that section
you'll see a create button

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for creating what are
known as the access token

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and the access token secret.

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So the API key, the API secret key,

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the access token and
the access token secret

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all four pieces are
required for the purpose of

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authenticating with Twitter.

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Now once you have that information

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on your Keys and tokens tab

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you're going to want to take it

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and put it into this file called keys.py

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which you'll find with
this lesson's examples

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actually this is from the textbook

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but it's ch12 examples for these videos,

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and you can see we've put in fake values

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for a bunch of variables here.

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The four that we were just talking about

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are the API key, the API secret key,

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those are the what we called

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consumer key and consumer secret

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and then the access token
and the access token secret

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are the other two pieces
of information you needed

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to click the create button

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for to generate in the first place.

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Later on in this lesson
we'll also get a key

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from the MapQuest mapping API

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and you'll insert that
value into keys.py as well.

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So you're going to want to save that file

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and we'll be importing
that file into the sessions

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that we create and sometimes
into scripts as well

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so that we have access to those
four pieces of information

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we need for validating our login.

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It's really important
that you don't hard code

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those values directly
into your source code

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and that you never give
those values to anyone else

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otherwise again if you
go past the rate limits

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that Twitter specifies
or you use the service

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in any way that's not allowed

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your developer account could
be terminated in that case.

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Now simply separating them into
a different source code file

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is not particularly secure.

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If in fact you are dealing with values

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that you really need to keep secure

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you probably are going to
want to use some sort of

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encryption library.

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For example one of the popular
Python encryption libraries

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is called bcrypt, I'll just
type the name of it here

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so you whoops B-C-R-Y-P-T

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so that's the name of the library

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and you may wanna use a library like that

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for encrypting the data

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and storing it in an encrypted manner

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on your system and then
loading it only as you need it

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for shipping it off to Twitter
for authentication purposes.

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Now all four pieces of that information

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are part of what is known as

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oauth 2.0 authentication,

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and the process of doing
that authentication

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is handled for you by the Tweepi libraries

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as you're going to see shortly.