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Python: Which statement about defaultdict for Grouping is the strongest interview answer?

Difficulty:

Easy

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

Which statement about defaultdict for Grouping is the strongest interview answer?

  1. defaultdict supplies a default value factory so grouping and aggregation code can avoid repeated missing-key checks.
  2. defaultdict for Grouping is mostly a naming style choice and has little effect on runtime behavior or design tradeoffs.
  3. defaultdict for Grouping exists mainly to reduce the number of files in a Python project.
  4. defaultdict for Grouping matters only for frontend scripting and not for backend or automation code.

Hint

Start with the core rule behind defaultdict for Grouping.

Answer and rationale

Correct answer: A. defaultdict supplies a default value factory so grouping and aggregation code can avoid repeated missing-key checks.

defaultdict supplies a default value factory so grouping and aggregation code can avoid repeated missing-key checks. This is the base concept interviewers commonly test first.

Track: Python