README.rst

January 20, 2026 · View on GitHub

############# flake8-slots #############

.. start short_desc

A Flake8 plugin to require slots to be defined for subclasses of immutable types.

.. end short_desc

.. start shields

.. list-table:: :stub-columns: 1 :widths: 10 90

* - Docs
  - |docs| |docs_check|
* - Tests
  - |actions_linux| |actions_windows| |actions_macos| |coveralls|
* - PyPI
  - |pypi-version| |supported-versions| |supported-implementations| |wheel|
* - Anaconda
  - |conda-version| |conda-platform|
* - Activity
  - |commits-latest| |commits-since| |maintained| |pypi-downloads|
* - QA
  - |codefactor| |actions_flake8| |actions_mypy|
* - Other
  - |license| |language| |requires|

.. |docs| image:: https://img.shields.io/readthedocs/flake8-slots/latest?logo=read-the-docs :target: https://flake8-slots.readthedocs.io/en/latest :alt: Documentation Build Status

.. |docs_check| image:: https://github.com/python-formate/flake8-slots/workflows/Docs%20Check/badge.svg :target: https://github.com/python-formate/flake8-slots/actions?query=workflow%3A%22Docs+Check%22 :alt: Docs Check Status

.. |actions_linux| image:: https://github.com/python-formate/flake8-slots/workflows/Linux/badge.svg :target: https://github.com/python-formate/flake8-slots/actions?query=workflow%3A%22Linux%22 :alt: Linux Test Status

.. |actions_windows| image:: https://github.com/python-formate/flake8-slots/workflows/Windows/badge.svg :target: https://github.com/python-formate/flake8-slots/actions?query=workflow%3A%22Windows%22 :alt: Windows Test Status

.. |actions_macos| image:: https://github.com/python-formate/flake8-slots/workflows/macOS/badge.svg :target: https://github.com/python-formate/flake8-slots/actions?query=workflow%3A%22macOS%22 :alt: macOS Test Status

.. |actions_flake8| image:: https://github.com/python-formate/flake8-slots/workflows/Flake8/badge.svg :target: https://github.com/python-formate/flake8-slots/actions?query=workflow%3A%22Flake8%22 :alt: Flake8 Status

.. |actions_mypy| image:: https://github.com/python-formate/flake8-slots/workflows/mypy/badge.svg :target: https://github.com/python-formate/flake8-slots/actions?query=workflow%3A%22mypy%22 :alt: mypy status

.. |requires| image:: https://dependency-dash.repo-helper.uk/github/python-formate/flake8-slots/badge.svg :target: https://dependency-dash.repo-helper.uk/github/python-formate/flake8-slots/ :alt: Requirements Status

.. |coveralls| image:: https://img.shields.io/coveralls/github/python-formate/flake8-slots/master?logo=coveralls :target: https://coveralls.io/github/python-formate/flake8-slots?branch=master :alt: Coverage

.. |codefactor| image:: https://img.shields.io/codefactor/grade/github/python-formate/flake8-slots?logo=codefactor :target: https://www.codefactor.io/repository/github/python-formate/flake8-slots :alt: CodeFactor Grade

.. |pypi-version| image:: https://img.shields.io/pypi/v/flake8-slots :target: https://pypi.org/project/flake8-slots/ :alt: PyPI - Package Version

.. |supported-versions| image:: https://img.shields.io/pypi/pyversions/flake8-slots?logo=python&logoColor=white :target: https://pypi.org/project/flake8-slots/ :alt: PyPI - Supported Python Versions

.. |supported-implementations| image:: https://img.shields.io/pypi/implementation/flake8-slots :target: https://pypi.org/project/flake8-slots/ :alt: PyPI - Supported Implementations

.. |wheel| image:: https://img.shields.io/pypi/wheel/flake8-slots :target: https://pypi.org/project/flake8-slots/ :alt: PyPI - Wheel

.. |conda-version| image:: https://img.shields.io/conda/v/domdfcoding/flake8-slots?logo=anaconda :target: https://anaconda.org/domdfcoding/flake8-slots :alt: Conda - Package Version

.. |conda-platform| image:: https://img.shields.io/conda/pn/domdfcoding/flake8-slots?label=conda%7Cplatform :target: https://anaconda.org/domdfcoding/flake8-slots :alt: Conda - Platform

.. |license| image:: https://img.shields.io/github/license/python-formate/flake8-slots :target: https://github.com/python-formate/flake8-slots/blob/master/LICENSE :alt: License

.. |language| image:: https://img.shields.io/github/languages/top/python-formate/flake8-slots :alt: GitHub top language

.. |commits-since| image:: https://img.shields.io/github/commits-since/python-formate/flake8-slots/v0.1.6 :target: https://github.com/python-formate/flake8-slots/pulse :alt: GitHub commits since tagged version

.. |commits-latest| image:: https://img.shields.io/github/last-commit/python-formate/flake8-slots :target: https://github.com/python-formate/flake8-slots/commit/master :alt: GitHub last commit

.. |maintained| image:: https://img.shields.io/maintenance/yes/2026 :alt: Maintenance

.. |pypi-downloads| image:: https://img.shields.io/pypi/dm/flake8-slots :target: https://pypistats.org/packages/flake8-slots :alt: PyPI - Downloads

.. end shields

============== ===================================================================== Code Description ============== ===================================================================== SLOT000 Define slots for subclasses of str SLOT001 Define slots for subclasses of tuple SLOT002 Define slots for subclasses of collections.namedtuple ============== =====================================================================

Use as a pre-commit hook

See pre-commit <https://github.com/pre-commit/pre-commit>_ for instructions

Sample .pre-commit-config.yaml:

.. code-block:: yaml

 - repo: https://gitlab.com/pycqa/flake8
   rev: 3.8.1
   hooks:
    - id: flake8
      additional_dependencies: [flake8-slots==0.1.6]

README.rst

Installation

Flake8 codes

Use as a pre-commit hook