Python Concurrency with asyncio

3 A first asyncio application

This chapter covers

• Using sockets to transfer data over a network
• Using telnet to communicate with a socket-based application
• Using selectors to build a simple event loop for non-blocking sockets
• Creating a non-blocking echo server that allows for multiple connections
• Handling exceptions in tasks
• Adding custom shutdown logic to an asyncio application

In chapters 1 and 2, we introduced coroutines, tasks, and the event loop. We also examined how to run long operations concurrently and explored some of asyncio’s APIs that facilitate this. Up to this point however, we’ve only simulated long operations with the sleep function.

Since we’d like to build more than just demo applications, we’ll use some real-world blocking ...