https://pydevtools.com/handbook/topics/debugging/ The Python Developer Tooling Handbook is a comprehensive guide to Python development tools including uv, ruff, pytest, mypy, ty, and more. Hugo -- gohugo.io en Mon, 13 Jul 2026 08:49:57 -0400 https://pydevtools.com/handbook/how-to/how-to-debug-a-python-script-with-pdb/ Mon, 13 Jul 2026 08:49:57 -0400 Tim Hopper https://pydevtools.com/handbook/how-to/how-to-debug-a-python-script-with-pdb/ <p>When a script prints the wrong number or crashes with a traceback, <code>print()</code> calls only go so far. <a href="https://pydevtools.com/handbook/reference/pdb/">pdb</a>, Python&rsquo;s built-in debugger, pauses the program mid-run so you can inspect variables and step through the code line by line until you reach the frame that failed. It ships in the standard library, so there is nothing to install.</p> <p>Every command below runs the same on macOS, Linux, and Windows. This guide uses one small script with a bug:</p>