013-debugging

Day 13 of Udemy's 100 Days of Code: Python Pro Bootcamp: finding and fixing bugs in Python code.

All exercises live in src/main.py, each commented out with the fix noted beside it. Uncomment one at a time to run it.

Exercises

Exercise	Bug	Fix
Describe the Problem	range(1, 20) never reaches 20, because the upper bound is excluded	Use range(1, 21)
Reproduce the Bug	dice_imgs[dice_num] raises IndexError when the roll is 6	Index with dice_num - 1
Play Computer	A birth year of exactly 1994 matches no branch	Use >= in the elif
Fix the Errors	input() returns a string, so age > 18 fails; the print is not indented	Convert with int(); indent the print
Print is Your Friend	== compares instead of assigning, so word_per_page stays 0	Use =
Use a Debugger	b_list.append(new_item) sits outside the loop, so only the last item is kept	Indent it into the loop

Debugging approach

1. Describe the problem in your own words.
2. Reproduce the bug.
3. Play computer: step through the code by hand.
4. Fix the errors the interpreter reports.
5. Use print() to inspect values.
6. Use a debugger to step through execution.

Running

Requires Python 3.

python src/main.py