Lesson 05

OOP, async, and HTTP

Compose robust programs with classes, concurrency, and reliable API calls.

Classes & dataclasses

from dataclasses import dataclass

@dataclass
class Quote:
    symbol: str
    price: float

q = Quote("SIG", 12.34)
print(q)           # Quote(symbol='SIG', price=12.34)
print(q.symbol)

Async/await

import asyncio

async def work(n: int):
    await asyncio.sleep(1)
    return n * n

async def main():
    results = await asyncio.gather(*(work(i) for i in range(3)))
    print(results)

asyncio.run(main())

HTTP requests

import requests

resp = requests.get("https://httpbin.org/json", timeout=5)
resp.raise_for_status()
data = resp.json()
print(data.get("slideshow", {}).get("title"))

Wrap up

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