Python Debugging: Fixing and Extending Existing Code

Writing code is only half the battle; real-world software development requires reading, understanding, and fixing code written by others. This text-based course guides you through the essential art of Python debugging, transforming you from someone who struggles with error messages into a developer who systematically diagnoses and resolves issues. You will learn how to read stack traces, use modern debugging tools, and write tests to prevent future regressions. What you'll learn: - Learn to interpret Python error messages and tracebacks to quickly locate the source of a bug. - Master the built-in Python debugger to step through code execution and inspect variables. - Apply modern debugging strategies, including using type hints and basic testing to catch errors early. - Understand how to safely refactor and extend unfamiliar codebases without breaking existing functionality. - Practice isolating bugs by creating minimal reproducible examples. The course begins with essential debugging terminology and foundational concepts before guiding you through systematic code investigation and hands-on scenarios where you analyze, repair, and enhance existing Python scripts. This course is designed for beginner Python learners who want to transition from writing simple scripts to managing and maintaining real-world code. Start reading today to build the confidence to debug and extend any Python program you encounter.