What is alternate to asyncio in Python?

Asyncio is Python's built-in asynchronous programming framework, allowing you to write non-blocking code by using async/await syntax. However, asyncio is not the only game in town for async in Python. Here are some alternative options:

Twisted

Twisted predates asyncio and has been a popular async framework for Python for many years. Like asyncio, it allows you to write non-blocking network code using a event-driven programming model.

Twisted supports not only TCP servers but also web servers, DNS, SSH, and more out of the box. It has an active community behind it. The API can be more complex than asyncio, but Twisted excels at advanced use cases like proxies, deferreds, and reactors.

from twisted.internet import reactor, protocol

class Echo(protocol.Protocol):
    def dataReceived(self, data):
        self.transport.write(data)

def main():
    factory = protocol.ServerFactory()
    factory.protocol = Echo
    reactor.listenTCP(8000,factory)
    reactor.run()

if __name__ == '__main__':
    main()

Trio

Trio is a newer async library that builds on the ideas of asyncio with an emphasis on usability and consistency. Like asyncio, Trio utilizes the async/await syntax. It bills itself as a friendly alternative to asyncio for concurrent and networked programming.

Some of Trio's strengths include built-in synchronization primitives like locks, excellent documentation and tutorials, and an focus on robustness. The API strives to eliminate "gotchas" in favor of clarity.

import trio

async def child1():
   print("child1: started! sleeping now...")
   await trio.sleep(1)
   print("child1: exiting!")

async def parent():
    async with trio.open_nursery() as nursery:
        nursery.start_soon(child1)

trio.run(parent)

In summary, while asyncio is great for many async use cases, alternatives like Twisted and Trio are worth exploring depending on your specific needs and preferences. The Python async ecosystem continues to evolve rapidly.