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frozenlist

A list-like structure which implements collections.abc.MutableSequence

Downloads: 0 (30 days)
View on PyPIGitHubOwner: aio-libs

Description

frozenlist
==========

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Introduction
------------

``frozenlist.FrozenList`` is a list-like structure which implements
``collections.abc.MutableSequence``. The list is *mutable* until ``FrozenList.freeze``
is called, after which list modifications raise ``RuntimeError``:


>>> from frozenlist import FrozenList
>>> fl = FrozenList([17, 42])
>>> fl.append('spam')
>>> fl.append('Vikings')
>>> fl
<FrozenList(frozen=False, [17, 42, 'spam', 'Vikings'])>
>>> fl.freeze()
>>> fl
<FrozenList(frozen=True, [17, 42, 'spam', 'Vikings'])>
>>> fl.frozen
True
>>> fl.append("Monty")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "frozenlist/_frozenlist.pyx", line 97, in frozenlist._frozenlist.FrozenList.append
    self._check_frozen()
  File "frozenlist/_frozenlist.pyx", line 19, in frozenlist._frozenlist.FrozenList._check_frozen
    raise RuntimeError("Cannot modify frozen list.")
RuntimeError: Cannot modify frozen list.


FrozenList is also hashable, but only when frozen. Otherwise it also throws a RuntimeError:


>>> fl = FrozenList([17, 42, 'spam'])
>>> hash(fl)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "frozenlist/_frozenlist.pyx", line 111, in frozenlist._frozenlist.FrozenList.__hash__
    raise RuntimeError("Cannot hash unfrozen list.")
RuntimeError: Cannot hash unfrozen list.
>>> fl.freeze()
>>> hash(fl)
3713081631934410656
>>> dictionary = {fl: 'Vikings'} # frozen fl can be a dict key
>>> dictionary
{<FrozenList(frozen=True, [1, 2])>: 'Vikings'}


Installation
------------

::

   $ pip install frozenlist


Documentation
-------------

https://frozenlist.aio-libs.org

Communication channels
----------------------

We have a *Matrix Space* `#aio-libs-space:matrix.org
<https://matrix.to/#/%23aio-libs-space:matrix.org>`_ which is
also accessible via Gitter.

License
-------

``frozenlist`` is offered under the Apache 2 license.

Source code
-----------

The project is hosted on GitHub_

Please file an issue in the `bug tracker
<https://github.com/aio-libs/frozenlist/issues>`_ if you have found a bug
or have some suggestions to improve the library.

.. _GitHub: https://github.com/aio-libs/frozenlist

=========
Changelog
=========

..
    You should *NOT* be adding new change log entries to this file, this
    file is managed by towncrier. You *may* edit previous change logs to
    fix problems like typo corrections or such.
    To add a new change log entry, please see
    https://pip.pypa.io/en/latest/development/contributing/#news-entries
    we named the news folder "changes".

    WARNING: Don't drop the next directive!

.. towncrier release notes start

v1.8.0
======

*(2025-10-05)*


Contributor-facing changes
--------------------------

- The ``reusable-cibuildwheel.yml`` workflow has been refactored to
  be more generic and ``ci-cd.yml`` now holds all the configuration
  toggles -- by `@webknjaz <https://github.com/sponsors/webknjaz>`__.

  *Related issues and pull requests on GitHub:*
  `#668 <https://github.com/aio-libs/frozenlist/issues/668>`__.

- When building wheels, the source distribution is now passed directly
  to the ``cibuildwheel`` invocation -- by `@webknjaz <https://github.com/sponsors/webknjaz>`__.

  *Related issues and pull requests on GitHub:*
  `#669 <https://github.com/aio-libs/frozenlist/issues/669>`__.

- Builds and tests have been added to
  ``ci-cd.yml`` for arm64 Windows wheels -- by `@finnagin <https://github.com/sponsors/finnagin>`__.

  *Related issues and pull requests on GitHub:*
  `#677 <https://github.com/aio-libs/frozenlist/issues/677>`__.

- Started building wheels for CPython 3.14 -- by `@kumaraditya303 <https://github.com/sponsors/kumaraditya303>`__.

  *Related issues and pull requests on GitHub:*
  `#681 <https://github.com/aio-libs/frozenlist/issues/681>`__, `#682 <https://github.com/aio-libs/frozenlist/issues/682>`__.

- Removed ``--config-settings=pure-python=false`` from ``requirements/dev.txt``.
  Developers on CPython still get accelerated builds by default. To explicitly build
  a pure Python wheel, use ``pip install -e . --config-settings=pure-python=true``
  -- by `@bdraco <https://github.com/sponsors/bdraco>`__.

  *Related issues and pull requests on GitHub:*
  `#687 <https://github.com/aio-libs/frozenlist/issues/687>`__.


----


v1.7.0
======

*(2025-06-09)*


Features
--------

- Added deepcopy support to FrozenList -- by `@bdraco <https://github.com/sponsors/bdraco>`__.

  *Related issues and pull requests on GitHub:*
  `#659 <https://github.com/aio-libs/frozenlist/issues/659>`__.


Packaging updates and notes for downstreams
-------------------------------------------

- Fixed an issue where ``frozenlist`` binary wheels would be built with debugging symbols and line tracing enabled, which significantly impacted performance. Line tracing is now disabled by default and can only be enabled explicitly -- by `@bdraco <https://github.com/sponsors/bdraco>`__.

  This change ensures that production builds are optimized for performance. Developers who need line tracing for debugging purposes can still enable it by:

  1. Setting the ``FROZENLIST_CYTHON_TRACING`` environment variable
  2. Using the ``--config-setting=with-cython-tracing=true`` option with pip

  *Related issues and pull requests on GitHub:*
  `#660 <https://github.com/aio-libs/frozenlist/issues/660>`__.

- Enabled ``PIP_CONSTRAINT`` environment variable in the build configuration to ensure the pinned Cython version from ``requirements/cython.txt`` is used during wheel builds.

  *Related issues and pull requests on GitHub:*
  `#661 <https://github.com/aio-libs/frozenlist/issues/661>`__.


----


v1.6.2
======

*(2025-06-03)*


No significant changes.


----


v1.6.1
======

*(2025-06-02)*


Bug fixes
---------

- Correctly use ``cimport`` for including ``PyBool_FromLong`` -- by `@lysnikolaou <https://github.com/sponsors/lysnikolaou>`__.

  *Related issues and pull requests on GitHub:*
  `#653 <https://github.com/aio-libs/frozenlist/issues/653>`__.


Packaging updates and notes for downstreams
-------------------------------------------

- Exclude ``_frozenlist.cpp`` from bdists/wheels -- by `@musicinmybrain <https://github.com/sponsors/musicinmybrain>`__.

  *Related issues and pull requests on GitHub:*
  `#649 <https://github.com/aio-libs/frozenlist/issues/649>`__.

- Updated to use Cython 3.1 universally across the build path -- by `@lysnikolaou <https://github.com/sponsors/lysnikolaou>`__.

  *Related issues and pull requests on GitHub:*
  `#654 <https://github.com/aio-libs/frozenlist/issues/654>`__.


----


v1.6.0
======

*(2025-04-17)*


Bug fixes
---------

- Stopped implicitly allowing the use of Cython pre-release versions when
  building the distribution package -- by `@ajsanchezsanz <https://github.com/sponsors/ajsanchezsanz>`__ and
  `@markgreene74 <https://github.com/sponsors/markgreene74>`__.

  *Related commits on GitHub:*
  `41591f2 <https://github.com/aio-libs/frozenlist/commit/41591f2>`__.


Features
--------

- Implemented support for the free-threaded build of CPython 3.13 -- by `@lysnikolaou <https://github.com/sponsors/lysnikolaou>`__.

  *Related issues and pull requests on GitHub:*
  `#618 <https://github.com/aio-libs/frozenlist/issues/618>`__.

- Started building armv7l wheels -- by `@bdraco <https://github.com/sponsors/bdraco>`__.

  *Related issues and pull requests on GitHub:*
  `#642 <https://github.com/aio-libs/frozenlist/issues/642>`__.


Packaging updates and notes for downstreams
-------------------------------------------

- Stopped implicitly allowing the use of Cython pre-release versions when
  building the distribution package -- by `@ajsanchezsanz <https://github.com/sponsors/ajsanchezsanz>`__ and
  `@markgreene74 <https://github.com/sponsors/markgreene74>`__.

  *Related commits on GitHub:*
  `41591f2 <https://github.com/aio-libs/frozenlist/commit/41591f2>`__.

- Started building wheels for the free-threaded build of CPython 3.13 -- by `@lysnikolaou <https://github.com/sponsors/lysnikolaou>`__.

  *Related issues and pull requests on GitHub:*
  `#618 <https://github.com/aio-libs/frozenlist/issues/618>`__.

- The packaging metadata switched to including an SPDX license identifier introduced in `PEP 639 <https://peps.python.org/pep-639>`__ -- by `@cdce8p <https://github.com/sponsors/cdce8p>`__.

  *Related issues and pull requests on GitHub:*
  `#639 <https://github.com/aio-libs/frozenlist/issues/639>`__.


Contributor-facing changes
--------------------------

- GitHub Actions CI/CD is now configured to manage caching pip-ecosystem
  dependencies using `re-actors/cache-python-deps`_ -- an action by
  `@webknjaz <https://github.com/sponsors/webknjaz>`__ t