Question 1 of 6
What does chain.from_iterable() do?
Trace what values the selected iterator returns, and whether order matters.
It yields elements from each inner iterable one after another.
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Quiz
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Test your knowledge: itertools
Check lazy iterator pipelines, bounded slicing, batching, adjacent pairs, running aggregates, and combinatorial selections.
6 questions
~6 min
Intermediate
Knowledge check
Test your knowledge: itertools
Check lazy iterator pipelines, bounded slicing, batching, adjacent pairs, running aggregates, and combinatorial selections.
- Stuck? Each question has an optional hint.
- Skip a hard question and review it before your results.
- Questions and answer options can shuffle between attempts.
You can retake this quiz whenever you like.
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Question 2 of 6
Why is a finite stop important when using islice() on count()?
Trace what values the selected iterator returns, and whether order matters.
count() does not end naturally, so a finite stop limits how many elements are requested.
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Question 3 of 6
What can happen to the last tuple from batched(items, 3)?
Trace what values the selected iterator returns, and whether order matters.
With strict=False by default, a final partial batch is returned.
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Question 4 of 6
What does pairwise([1, 4, 9, 16]) yield?
Trace what values the selected iterator returns, and whether order matters.
pairwise() slides one position at a time and yields overlapping adjacent pairs.
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Question 5 of 6
When should combinations() be chosen instead of permutations()?
Trace what values the selected iterator returns, and whether order matters.
combinations() treats selections with the same positions in a different order as one selection.
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Question 6 of 6
What does itertools.groupby() group together?
Think about whether groupby() reorders or aggregates items across the whole input.
groupby() creates a group when the key changes, so matching keys separated by another key form separate groups. Sort by the same key first when you need equal keys to be adjacent.
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Quiz results
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Review
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What does chain.from_iterable() do?Hint used
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Why is a finite stop important when using islice() on count()?Hint used
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What can happen to the last tuple from batched(items, 3)?Hint used
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What does pairwise([1, 4, 9, 16]) yield?Hint used
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When should combinations() be chosen instead of permutations()?Hint used
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What does itertools.groupby() group together?Hint used