Asyncio is a Python library that provides a framework for writing single-threaded concurrent code using coroutines, multiplexing I/O access over sockets and other resources, launching lightweight threads from asynchronous code, and more. This tutorial will guide you through the basics of asyncio networking.
Overview
- What is Asyncio? Asyncio is a Python library that allows for asynchronous programming. It is built into Python 3.4 and later versions.
- Why Use Asyncio? Asyncio is used to improve the performance of I/O-bound and high-level structured network code.
- Key Concepts:
- Coroutines: Functions that can be paused and resumed, allowing for concurrent execution.
- Event Loop: Manages the execution of coroutines and the handling of I/O events.
- Tasks: A task is an instance of a coroutine that is scheduled to be executed by the event loop.
Basic Usage
To get started with asyncio networking, you can use the asyncio library to create a simple server and client.
import asyncio
async def main():
server = await asyncio.start_server(
lambda host, port: print(f'Server started at {host}:{port}'),
'127.0.0.1',
8888
)
async with server:
await server.serve_forever()
asyncio.run(main())
In this example, we create a server that listens on port 8888 and prints a message when it starts.
Advanced Topics
- Handling I/O Events: Asyncio provides various functions to handle I/O events, such as
asyncio.open_connection()for establishing a TCP connection. - Multiplexing I/O: Asyncio allows you to multiplex I/O access over multiple sockets and other resources.
- Structured Networking: Asyncio supports structured networking, which allows you to write network code in a more readable and maintainable way.
Further Reading
For more information on asyncio networking, check out the following resources:
By following these tutorials, you will gain a solid understanding of asyncio networking and be able to write efficient and scalable network applications in Python.