What this snippet does
groupby only groups consecutive elements; unsorted data yields duplicate groups for the same key.
Expected output
[[{'k': 'a'}], [{'k': 'b'}], [{'k': 'a'}]]Why practise typing this
Typing itertools & functools 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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