What are some practical examples of using Python's asyncio library?

What are some practical examples of using Python's asyncio library?

Python's asyncio library is great for writing concurrent code using the async/await syntax. Some practical examples include web scraping, handling multiple I/O-bound tasks, and building asynchronous web servers.

Can you show me a simple code example?

Sure! Here's a simple example that fetches data from multiple URLs concurrently:

import asyncio
import aiohttp

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 are the benefits of using asyncio over threading?

Asyncio is generally more efficient for I/O-bound tasks because it uses a single-threaded event loop, reducing the overhead of context switching. It also avoids issues like race conditions that can occur with threading.

Are there any limitations to using asyncio?

Yes, asyncio is not ideal for CPU-bound tasks since it runs in a single thread. For CPU-bound tasks, you might want to consider using multiprocessing instead.