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merge with 3.3.

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Georg Brandl 2012-10-06 22:39:16 +02:00
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Doc/library/collections.rst
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@ -347,24 +347,24 @@ or subtracting from an empty counter.
this section documents the minimum range and type restrictions.
* The :class:`Counter` class itself is a dictionary subclass with no
restrictions on its keys and values. The values are intended to be numbers
representing counts, but you *could* store anything in the value field.
restrictions on its keys and values. The values are intended to be numbers
representing counts, but you *could* store anything in the value field.
* The :meth:`most_common` method requires only that the values be orderable.
* For in-place operations such as ``c[key] += 1``, the value type need only
support addition and subtraction. So fractions, floats, and decimals would
work and negative values are supported. The same is also true for
:meth:`update` and :meth:`subtract` which allow negative and zero values
for both inputs and outputs.
support addition and subtraction. So fractions, floats, and decimals would
work and negative values are supported. The same is also true for
:meth:`update` and :meth:`subtract` which allow negative and zero values
for both inputs and outputs.
* The multiset methods are designed only for use cases with positive values.
The inputs may be negative or zero, but only outputs with positive values
are created. There are no type restrictions, but the value type needs to
support addition, subtraction, and comparison.
The inputs may be negative or zero, but only outputs with positive values
are created. There are no type restrictions, but the value type needs to
support addition, subtraction, and comparison.
* The :meth:`elements` method requires integer counts. It ignores zero and
negative counts.
negative counts.
.. seealso::