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Lots of times, we want to let users send
in arguments and values through the URL.

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The most common way of doing this is by
using what's call the query string.

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You've seen them before, they're the bit
in the URL after the question mark.

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In Flask, we can get to this pretty
easily, let's find out how.

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>> All right, so before we can get to the
request object which we need in order to

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get to our arguments there.

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We have to actually have their request
object.

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Which is flask is a, it's a simple import
emphasis global object.

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The Python programmer in me kind of
cringes at it being this global object,

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but that's what it is, that's, we're gonna
use it so it's fine.

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This is kind of cool though it being a
global object because it means the request

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is available every where.

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It's always available.

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So that's great, but the only place that

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we're really gonna deal with it is inside
of our views because requests go to views.

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So inside of our index view we're gonna
add a couple of things.

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Here in the function declaration right
here, let's add a key word argument of

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name and we're gonna give it, not Kenneth,
let's give it treehouse.

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So then what we want to do is we want to
take treehouse out of here,

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and we want to put something in here.

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.format name.

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Okay.

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So, let's let's test that and see if that
works.

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Yeah, we still get Hello from Treehouse.

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Now, you know, that, or you notice that I,

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I changed this, but I didn't have to do
anything down here.

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I can just leave it running.

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That's because we have this debug true.

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That makes it reload whenever this code
changes.

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Pretty handy.

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Okay.
So

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now let's make sure that we can set this
new value.

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In the request object there's an attribute
called args that holds all of

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the arguments in the request.

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If you're familiar with web development
this would be things like the get or

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post values.

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Or rather they get and post keywords and
their values.

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It's like a dictionary so we're gonna use
the .get method.

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If the name key isn't there then we're
just gonna use the default name so

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let's do name equals request.args.get name
or just the name that was already set.

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All right.

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So if we get a name great.

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If we don't.

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Use this name.

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Okay?

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Okay.
So, we'll refresh.

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Hello from Treehouse still, and

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then let's add we add question mark which
is what specifies our query values,

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and then we do name and we're gonna say
name equals Kenneth.

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And now it's named Hello from Kenneth.

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So that's pretty cool.

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We get a different name.

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Accessing get variables is a good way to
let users pass in values.

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But query strings are often pretty ugly.

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In fact they're so ugly I'd rather show
you a better way.

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Let's clean up our URLs in the next video.