Modern APIs with FastAPI and Python Transcripts
Chapter: Building a realistic API
Lecture: Open Weather data info

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0:00 Well, we've built a really cool API
0:02 that echoes back what you send it. Not super useful,
0:05 is it? So, of course,
0:06 what we want to do here is to pass this information along and actually call the
0:11 place that has the real weather report,
0:12 bundle it up and re-send back.
0:14 So, let's go and create another thing over here called "services".
0:20 And here we'll put the "open weather service",
0:25 which is gonna be the few functions we need to interact with this open weather service.
0:29 And we're gonna have a function called "get_report".
0:32 It's gonna be simple, let's have a city, let's go state, country, units like that, and
0:38 units is gonna be a string.
0:40 This is going to be an optional string.
0:47 Actually, this one we made required,
0:49 didn't we? But we just give it a default.
0:51 And then this is going to be a string,
0:53 and it's gonna return for now,
0:55 let's say it just returns some arbitrary dictionary.
0:58 Now what? How do we call this thing?
1:00 So let's actually go over to "openweathermap.org" and you can see they're
1:05 doing a ton of predictions and calls,
1:07 right? So apparently two billion forecasts a day.
1:10 That's a lot of forecasts. Let's go to the API.
1:12 Remember you're gonna have to sign in and create an API key to do
1:17 this. It's free, but you have to do it.
1:19 Let's just look while we're here, pricing is free.
1:21 We get a free API, key 60 calls a minute,
1:24 a million calls a month. Sorry said that a day; it's a month,
1:27 which is plenty for our little demo app.
1:29 So let's look at this. There's a couple of options.
1:32 We make a request to all of these various places here.
1:36 We can do just the city,
1:38 city and state, city state country.
1:40 Alright, so that's what we're gonna need to do.
1:42 And we'll just go down here say the URL is equal to this.
1:46 Let's put https at the front,
1:49 and the query equals something that goes here.
1:54 Let's put, we're gonna create a little string called "Q",
1:56 they we're gonna create another thing called "Key" for the API key.
2:00 Those don't exist yet, so let's go over here and say "q=",
2:04 well, what's required? We're gonna have "city,
2:08 country", like that. And where do we pass the units over?
2:14 That's right. So we can pass the units
2:15 I think we pass them. Alright.
2:18 And then the key is going to be "123" for the moment.
2:23 Alright. So let's just say this is the URL that we're going to need to
2:26 call. And we'll print out URL,
2:29 and here we'll say "report equals open weather service dot
2:34 get report" and pass the things on, location dot
2:37 city, location dot state, location dot country and units.
2:52 We're gonna return that back. So let's give this a try and see what happens.
2:54 We go and click that. Well,
2:57 we got nothing back, which is fine,
2:59 but it says here is the URL we would go click on and close.
3:04 It's close. Portland, US. But we need to get our app ID.
3:10 So what I'm gonna do is I'm gonna add my app ID,
3:13 but I'm not going to show it to you guys because you got to get your
3:15 own. But I'll show you how we're gonna do that next.
3:17 So we're pretty close to calling this API endpoint and getting stuff back,
3:21 but we gotta handle this shared secret, this secret in our project.