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Python: Which practice avoids a common mistake with Sets and Membership Testing?

Difficulty:

Medium

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

Which practice avoids a common mistake with Sets and Membership Testing?

  1. Ignore the Sets and Membership Testing issue and rely on team discipline instead of clearer APIs or invariants.
  2. Silence the Sets and Membership Testing problem by using broad catches, hidden globals, or extra shared mutable state.
  3. Prefer the version of Sets and Membership Testing that makes behavior less predictable as long as the code still runs.
  4. Do not choose a set when stable order or duplicate counts are required by the problem.

Hint

Look for the option that protects correctness instead of hiding the problem.

Answer and rationale

Correct answer: D. Do not choose a set when stable order or duplicate counts are required by the problem.

Do not choose a set when stable order or duplicate counts are required by the problem. This is a common failure mode in real Python code and a frequent interview follow-up.

Track: Python