Summary - HTTP and aiohttp

Combine ClientSession, get and json to write a weather client.

Summary - HTTP and aiohttp

In this group you learned HTTP requests. With urllib.request you make synchronous requests; with aiohttp.ClientSession you make asynchronous ones. session.get and session.post give different request types; await resp.text() gives the body; json.loads parses structured data.

async with aiohttp.ClientSession() as session:
    async with session.get(url) as resp:
        data = json.loads(await resp.text())

In the final step you will combine all of these to write a weather client.

Exercise Weather client

Start with import asyncio, import aiohttp and import json. Inside async def main() open async with aiohttp.ClientSession() as session:. Make a GET request with async with session.get("https://example.com") as resp:. Get the body with text = await resp.text(). Turn it into a dict with data = json.loads(text). Print the city with print(data["sehir"]). Add asyncio.run(main()).

Show example solution

import asyncio
import aiohttp
import json

class _S:
    async def __aenter__(self): return self
    async def __aexit__(self, *a): return False
    def get(self, url): return self
    async def text(self): return '{"sehir": "İstanbul"}'

aiohttp.ClientSession = _S

async def main():
    async with aiohttp.ClientSession() as session:
        async with session.get('https://example.com') as resp:
            text = await resp.text()
            data = json.loads(text)
            print(data['sehir'])

asyncio.run(main())

Test yourself

Which function parses the response body as structured data?
- urlopen
- json.loads
- session.get
- asyncio.run
Show answer

json.loads — json.loads(string) turns structured data into a dict.
Match the group tools

urllib.request

Synchronous request
aiohttp.ClientSession

Async session
session.get

GET request
json.loads

Parses structured data

Next lesson: Engine

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies