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Python 3.13 · Visual Studio 2026 · 40 Lessons
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Get the Full Book →1# Python 3.13 — dataclasses, async generators, type hints
2from dataclasses import dataclass, field
3from typing import AsyncGenerator
4import asyncio
5
6@dataclass
7class Product:
8 name: str
9 price: float
10 tags: list[str] = field(default_factory=list)
11
12async def fetch_deals(products: list[Product]) -> AsyncGenerator[Product, None]:
13 for p in products:
14 await asyncio.sleep(0)
15 if p.price < 50.0:
16 yield p
17
18async def main():
19 catalog = [Product("Widget", 29.99), Product("Gadget", 99.00)]
20 async for deal in fetch_deals(catalog):
21 print(f"Deal: {deal.name} at ${deal.price}")
22
23asyncio.run(main())
