Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the type errors pattern
Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.
What went wrong: / always gives a float, such as 1.5 or even 2.0. A list index must be a whole number.
The fix: return items[len(items) // 2]
Remember: use // when you need a whole number, such as an index.
The pattern behind it: type errors.
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