What this snippet does
deque provides O(1) append and pop operations from both ends, unlike lists.
Expected output
deque([0, 1, 2, 3])
Why practise typing this
Typing collections (advanced) code builds muscle memory for the symbols and indentation Python uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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