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: isdigit() needs every character to be a digit. "-" is not a digit.
The fix: try: int(text) then return True, and except ValueError: return False
Remember: the surest way to check "is this a number?" is to try converting it.
The pattern behind it: type errors.
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<iframe src="https://trybughunt.com/embed/25ac5b07-748d-4663-9275-51f671b637dd" title="Debugging challenge: Number check rejects negative numbers" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe>
<p style="font-size:14px">Debugging challenge from <a href="https://trybughunt.com/challenges/25ac5b07-748d-4663-9275-51f671b637dd">TryBugHunt</a></p>