What are some use cases for async and await in Python?

What are some use cases for async and await in Python?

Async and await in Python are used for concurrent programming. Common use cases include web scraping, handling I/O-bound tasks, and building web servers.

Can you give me an example of web scraping using async?

Sure! You can use libraries like aiohttp to fetch multiple web pages concurrently. Here's a simple example:

import aiohttp
import asyncio

async def fetch(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as response:
            return await response.text()

async def main():
    urls = ['http://example.com', 'http://example.org']
    tasks = [fetch(url) for url in urls]
    results = await asyncio.gather(*tasks)
    print(results)

asyncio.run(main())

What about using async with databases?

Great question! Async can be used with databases to improve performance. Libraries like asyncpg for PostgreSQL allow you to run queries without blocking the event loop.

Are there any downsides to using async and await?

Yes, while async and await can improve performance, they add complexity to your code and may not be necessary for CPU-bound tasks.