In the previous tutorial, we learned about testing with pytest. Now let’s learn about async/await — Python’s way to run multiple tasks at the same time without threads. Async programming is one of the most powerful features in modern Python. It is used in web frameworks (FastAPI), HTTP clients (httpx), database drivers, and many other libraries. By the end of this tutorial, you will understand how async works and when to use it. ...
In the previous tutorial, we learned async programming with Tokio. Now we dive deeper into channels — the primary way async tasks communicate with each other. Channels let tasks send and receive messages without sharing memory directly. This is the “message passing” model of concurrency. Instead of locking shared data with a Mutex, you send data through a channel. The task that receives it owns it completely. Tokio provides four channel types. Each one solves a different problem. By the end of this tutorial, you will know when to use each one. ...