What this snippet does
A maxlen on a deque automatically discards old items when new ones are added.
Expected output
deque([2, 3, 4], maxlen=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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