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corona10 merged 5 commits into from
Feb 19, 2026
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gh-141510: Update Whats News for frozendict #144961

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gh-141510: Update Whats News for frozzendict
corona10 Feb 18, 2026
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Update Doc/whatsnew/3.15.rst
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corona10 Feb 19, 2026
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29 changes: 24 additions & 5 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -188,14 +188,33 @@ raise :exc:`SyntaxError`).
:pep:`814`: Add frozendict built-in type
----------------------------------------

A new public immutable type :class:`frozendict` is added to the :mod:`builtins`
module. It is not a ``dict`` subclass but inherits directly from ``object``.

A ``frozendict`` can be hashed with ``hash(frozendict)`` if all keys and values
can be hashed.
A new :term:`immutable` type, :class:`frozendict`, is added to the :mod:`builtins` module.
It does not allow modification after creation. A ``frozendict`` is not a subclass of ``dict``;
it inherits directly from ``object``. A ``frozendict`` is :term:`hashable`
as long as all of its keys and values are hashable. A ``frozendict`` preserves
insertion order, but comparison does not take order into account.

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@vstinner vstinner Feb 19, 2026

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Ah, you may add that it preserves insertion order, but that comparison doesn't take the order in account (your example proves it).

For example::

>>> a = frozendict(x=1, y=2)
>>> a
frozendict({'x': 1, 'y': 2})
>>> a['z'] = 3
Traceback (most recent call last):
File "<python-input-2>", line 1, in <module>
a['z'] = 3
~^^^^^
TypeError: 'frozendict' object does not support item assignment
>>> b = frozendict(y=2, x=1)
>>> hash(a) == hash(b)
True
>>> a == b
True

.. seealso:: :pep:`814` for the full specification and rationale.

(Contributed by Victor Stinner and Donghee Na in :gh:`141510`.)


.. _whatsnew315-profiling-package:

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