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| -rw-r--r-- | Doc/library/collections.rst | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst index 4b3bbe9..c28704b 100644 --- a/Doc/library/collections.rst +++ b/Doc/library/collections.rst @@ -236,13 +236,12 @@ Common patterns for working with :class:`Counter` objects:: c.most_common()[:-n:-1] # n least common elements c += Counter() # remove zero and negative counts -Several multiset mathematical operations are provided for combining -:class:`Counter` objects. Multisets are like regular sets but are allowed to -contain repeated elements (with counts of one or more). Addition and -subtraction combine counters by adding or subtracting the counts of -corresponding elements. Intersection and union return the minimum and maximum -of corresponding counts. Each operation can accept inputs with signed counts, -but the output excludes results with counts less than one. +Several mathematical operations are provided for combining :class:`Counter` +objects to produce multisets (counters that have counts greater than zero). +Addition and subtraction combine counters by adding or subtracting the counts +of corresponding elements. Intersection and union return the minimum and +maximum of corresponding counts. Each operation can accept inputs with signed +counts, but the output will exclude results with counts of zero or less. >>> c = Counter(a=3, b=1) >>> d = Counter(a=1, b=2) |