Metadata-Version: 2.1
Name: frozenlist
Version: 1.4.0
Summary: A list-like structure which implements collections.abc.MutableSequence
Home-page: https://github.com/aio-libs/frozenlist
Maintainer: aiohttp team <team@aiohttp.org>
Maintainer-email: team@aiohttp.org
License: Apache 2
Project-URL: Chat: Matrix, https://matrix.to/#/#aio-libs:matrix.org
Project-URL: Chat: Matrix Space, https://matrix.to/#/#aio-libs-space:matrix.org
Project-URL: CI: Github Actions, https://github.com/aio-libs/frozenlist/actions
Project-URL: Code of Conduct, https://github.com/aio-libs/.github/blob/master/CODE_OF_CONDUCT.md
Project-URL: Coverage: codecov, https://codecov.io/github/aio-libs/frozenlist
Project-URL: Docs: Changelog, https://github.com/aio-libs/frozenlist/blob/master/CHANGES.rst#changelog
Project-URL: Docs: RTD, https://frozenlist.aio-libs.org
Project-URL: GitHub: issues, https://github.com/aio-libs/frozenlist/issues
Project-URL: GitHub: repo, https://github.com/aio-libs/frozenlist
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Intended Audience :: Developers
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Development Status :: 5 - Production/Stable
Classifier: Operating System :: POSIX
Classifier: Operating System :: MacOS :: MacOS X
Classifier: Operating System :: Microsoft :: Windows
Requires-Python: >=3.8
Description-Content-Type: text/x-rst
License-File: LICENSE

==========
frozenlist
==========

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   :target: https://pypi.org/project/frozenlist
   :alt: frozenlist @ PyPI

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   :alt: Read The Docs build status badge

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   :alt: Matrix Space — #aio-libs-space:matrix.org

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

The library requires Python 3.8 or newer.


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.

Requirements
============

- Python >= 3.8

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