Track 9 · Lesson 10 of 11

A debugging strategy

Find bugs systematically: reproduce, isolate, hypothesise and test, inspect state with print(), and record what a program does with the logging module.

You will be able to

• Follow a repeatable process: reproduce, isolate, hypothesise, test, fix, confirm
• Use print() with f"{name=}" to inspect variable state at the right moment
• Narrow a bug down by testing each step of a pipeline separately (binary search through code)
• Log messages at DEBUG, INFO, WARNING and ERROR levels with the logging module, including tracebacks with logger.exception