https://techstay.tech/categories/python/My tech blog, focused on technologyHugo 0.166.0 & FixIt v1.0.0-alpha.2en-USFri, 11 Sep 2026 03:32:39 +0800https://techstay.tech/posts/understanding-python-async-in-ten-minutes/Fri, 09 May 2025 00:00:00 +0000https://techstay.tech/posts/understanding-python-async-in-ten-minutes/Python<p>Today, I&rsquo;ll introduce how to use asynchronous programming in Python. This article focuses on the usage of asynchronous programming, so it won&rsquo;t delve too much into underlying concepts.</p> <h2 class="heading-element" id="brief-introduction-to-concepts"><span>Brief Introduction to Concepts</span> <a href="#brief-introduction-to-concepts" class="heading-mark"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a> </h2><ul> <li><strong>Coroutine</strong>: A special function marked with <code>async</code> that can execute code asynchronously.</li> <li><strong>Event Loop</strong>: The core of Python asynchronous programming, responsible for scheduling coroutines.</li> <li><strong>Future</strong>: A low-level object representing the eventual result of an asynchronous operation.</li> <li><strong>Task</strong>: A wrapper for Future that can encapsulate coroutines and supports operations like cancellation.</li> </ul> <p>We all know that in operating systems, creating and switching processes and threads is very resource-intensive, making it prone to performance bottlenecks under high loads. Coroutines, on the other hand, are smaller execution units defined within the program. Since they don&rsquo;t involve the overhead of process and thread context switching, coroutines are much lighter. We can easily create and run thousands of coroutines in a program—something that would be impossible with processes and threads.</p>