Python Interview Questions · interview question
Which practice avoids a common mistake with defaultdict for Grouping?
Multiple choiceMediumpython-interview-2026interviewpythonpitfall
Answer and explanation
Correct answer
D. Do not let automatic key creation hide a bug where a missing key should have been treated as an error instead.
Why
Do not let automatic key creation hide a bug where a missing key should have been treated as an error instead. This is a common failure mode in real Python code and a frequent interview follow-up.
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