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Demo 2: Interactive Debugging with pdb 🐞

Goal

Use interactive debuggers to pause code, inspect variables, and step through execution.

Setup

  • Provided demo2-buggy-script.py with logic errors
  • Insert breakpoint() statements in the code where you want to pause

Tasks

  1. Insert breakpoint() near the suspected bug.
  2. Run the script with pdb: 
    python -m pdb demo2-buggy-script.py
  3. Use pdb commands:
  4. n (next line)
  5. s (step into function)
  6. p var (print variable)
  7. c (continue)
  8. Inspect variables and program flow.
  9. Fix the bug. Rerun to confirm.

Expected Outcomes

  • Students can pause code execution.
  • Students can inspect and modify variables interactively.
  • Students can step through code to find bugs.

Notes