What are the differences between popular async I/O libraries in Python?

What are the main differences between asyncio, Twisted, and Tornado?

Asyncio is part of the standard library and is great for simple async tasks. Twisted is more complex and supports various protocols, while Tornado is designed for handling long-lived connections and is excellent for web applications.

Which one should I use for a web application?

If you're building a web application, Tornado might be the best choice due to its ability to handle many simultaneous connections efficiently.

Can you give me an example of how to use asyncio?

Sure! Here's a simple example:

import asyncio

async def main():
    print('Hello')
    await asyncio.sleep(1)
    print('World')

asyncio.run(main())

What about performance comparisons between these libraries?

Performance can vary based on the use case. Generally, asyncio is very efficient for I/O-bound tasks, while Tornado excels in handling many connections. Twisted is powerful but can be more complex to optimize.