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gh-154746: Document collections.Counter internal order and display order #154777

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gh-154746: Document internal order and display order
rhettinger Jul 27, 2026
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Update Doc/library/collections.rst
rhettinger Jul 27, 2026
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9 changes: 9 additions & 0 deletions Doc/library/collections.rst
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Expand Up @@ -268,6 +268,15 @@ For example::
>>> c['sausage'] = 0 # counter entry with a zero count
>>> del c['sausage'] # del actually removes the entry

Counters maintain insertion order internally but display from most common to
least common when possible:

>>> c = Counter(a=1, b=2, c=3)
>>> c # display most common to least
Counter({'c': 3, 'b': 2, 'a': 1})
>>> list(c.items()) # original insertion order
[('a', 1), ('b', 2), ('c', 3)]

.. versionadded:: 3.1

.. versionchanged:: 3.7 As a :class:`dict` subclass, :class:`Counter`
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