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Update an itertool recipe from Python docs (#13543)

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Sebastian Rittau
2025-02-26 14:04:04 +01:00
committed by GitHub
parent bef43fc46e
commit 9da1df60be
1 changed files with 2 additions and 0 deletions
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stdlib/@tests/test_cases/itertools/check_itertools_recipes.py
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@@ -284,6 +284,8 @@ def unique_justseen(iterable: Iterable[_T], key: Callable[[_T], bool] | None = N
"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))
g: groupby[_T | bool, _T] = groupby(iterable, key)
return map(next, map(operator.itemgetter(1), g))