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Writing Plugins for Flake8

Since |Flake8| 2.0, the |Flake8| tool has allowed for extensions and custom plugins. In |Flake8| 3.0, we're expanding that ability to customize and extend and we're attempting to thoroughly document it. Some of the documentation in this section may reference third-party documentation to reduce duplication and to point you, the developer, towards the authoritative documentation for those pieces.

Getting Started

To get started writing a |Flake8| :term:`plugin` you first need:

  • An idea for a plugin
  • An available package name on PyPI
  • One or more versions of Python installed
  • A text editor or IDE of some kind
  • An idea of what kind of plugin you want to build:
    • Formatter
    • Check

Once you've gathered these things, you can get started.

All plugins for |Flake8| must be registered via entry points. In this section we cover:

  • How to register your plugin so |Flake8| can find it
  • How to make |Flake8| provide your check plugin with information (via command-line flags, function/class parameters, etc.)
  • How to make a formatter plugin
  • How to write your check plugin so that it works with |Flake8| 2.x and 3.x

Video Tutorial

Here's a tutorial which goes over building an ast checking plugin from scratch:

.. toctree::
    :caption: Plugin Developer Documentation
    :maxdepth: 2


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