![]() There’s also a printable pdb Command Reference you can use as a cheat sheet while debugging: ![]() You can find the source code for these examples on GitHub.Īt the end of this tutorial, there is a quick reference for Essential pdb Commands. The example code in this tutorial uses Python 3.6. This can be a life saver if you need to debug code in an environment where you don’t have access to the GUI debugger you’re familiar with. Pdb is part of Python’s standard library, so it’s always there and available for use. Sometimes, stepping through code in pdb and seeing how values change can be a real eye-opener and lead to “aha” moments, along with the occasional “face palm”. This is great for tracking down hard-to-find bugs and allows you to fix faulty code more quickly and reliably. ![]() You’ll also be able to stop and resume your application’s flow of execution at any moment, so you can see exactly how each line of code affects its internal state. You really need it.īy the end of this tutorial, you’ll know how to use the debugger to see the state of any variable in your application. When you need a debugger, there’s no substitute. pdb, and other debuggers, are indispensable tools. You may want to bookmark this tutorial for quick reference later when you might really need it. I’ll walk you through a few common uses of pdb. In this tutorial, I’ll show you the basics of using pdb, Python’s interactive source code debugger. Regardless of the situation, debugging code is a necessity, so it’s a good idea to be comfortable working in a debugger. However, at other times, you might be learning a new language feature or experimenting with a new approach and want to understand more deeply how something is working. You’re busy working under a time crunch and you just want it to work. Watch it together with the written tutorial to deepen your understanding: Python Debugging With pdbĭebugging applications can sometimes be an unwelcome activity. Watch Now This tutorial has a related video course created by the Real Python team.
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