#100DaysOfCode in Python Transcripts
Chapter: Days 97-99: Building JSON APIs
Lecture: Adding the Flask basics
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0:00
Alright, so this Flask is coming soon.
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Flask is coming now, let's do it.
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So we're going to import flask,
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and down here, remember, you have to create the Flask app.
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And I'm going to use it like this, so we always see
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the full namespace of flask,
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just so it's really clear what's going on here.
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And let's just build, like, a hello world,
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or welcome to our site, little view method here.
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So let's call this index.
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And you have to add the app.route decorator
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and in here we're just going to put forward slash.
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So that's going to tell it what to do,
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and then we'll just say return hello world.
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And just for good measure, just so we can keep track of this
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in the future, 'cause we're going to run into issues,
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let's add a not found 404 handler,
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and we'll just return the page was not found.
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So that's great.
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And then let's go down here and we'll actually
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have a main method, let's put that right at the top.
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That's my style.
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So we'll say app.run like so.
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And let's even say debug=True.
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That's going to be really nice for us, we'll see why in a bit.
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And then we'll say down here, we'll do our little
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main convention, that is in Python,
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and we'll run the main method if that's the case.
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Whew, okay, is it ready to run?
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Let's run our web app and see.
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Whoa, success.
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We have something here.
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Click on it.
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Hello world, awesome, how about that.
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What if we go to abc?
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Page was not found. Okay, so it looks like both the regular index
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and the not found stuff is working really well.
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So this is cool, and just so you know,
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what this debug=True is it'll watch these files
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and see if you make a change and automatically reload it.
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So let's go to hello world, three exclamation marks.
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Go over here, if I refresh.
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Automatically, I didn't have to do anything.
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Because down here, you can see
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it detected a change in that file.
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Restarting, debugger is active.
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Beautiful.
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Okay, so, this is all really good,
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we got our Flask up and running.
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But this doesn't feel very much like
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a JSON API method, does it?
