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| -rw-r--r-- | Doc/library/itertools.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index 36cea9a..03127af 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -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))) |