Modern APIs with FastAPI and Python Transcripts
Chapter: Building a realistic API
Lecture: Concept: Async API methods
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0:00
Let's review converting our regular API method to an async one. Well, we're gonna put async def weather instead of just def weather.
0:09
We don't need to change the router or the URL or anything like that. FastAPI can just deal with both kinds and that's fine.
0:16
We're going to say it's async, and then that only really makes sense to do if we're actually calling other async things.
0:23
We wanna ultimately call our API, or open weather map, asynchronously. So we're gonna make that intermediate piece asynchronous as well,
0:31
so then we're await, get report async, get our dictionary back, off it goes. Now, one step down, we've got our get report async and it is itself
0:41
async, right? And then we need to do something interesting within it, so we're gonna work with httpx instead of response, instead of requests,
0:49
I want to create an async with block and then we just await "client dot get url". Couldn't be simpler.
0:54
We swapped it over from the synchronous request version over to the asynchronous httpx version
0:59
by just really changing these two lines of code, sprinkling in some awaits, Good to go. A really, really nice way to add a huge amount of scalability
1:09
if we're waiting on external things like openweathermap.org.