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Optimize unique_justseen() recipe for a common case. (gh-113147)

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Raymond Hettinger 2023-12-14 17:27:39 -06:00 • committed by GitHub
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Doc/library/itertools.rst
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@ -1017,6 +1017,8 @@ which incur interpreter overhead.
"List unique elements, preserving order. Remember only the element just seen."
# unique_justseen('AAAABBBCCDAABBB') --> A B C D A B
# unique_justseen('ABBcCAD', str.lower) --> A B c A D
if key is None:
return map(operator.itemgetter(0), groupby(iterable))
return map(next, map(operator.itemgetter(1), groupby(iterable, key)))