Plugins’s behavior can be extended with third-party plugins. A plugin is a separately installed Python class that you register in your .coveragerc. Plugins can be used to implement coverage measurement for non-Python files.

Plugins are only supported with the C extension, which must be installed for plugins to work.

Information about using plugins is on this page. To write a plugin, see Plugin classes.

New in version 4.0.

Using plugins

To use a plugin, you install it, and configure it. For this example, let’s say there’s a Python package called something that provides a plugin called something.plugin.

  1. Install the plugin’s package as you would any other Python package:

    pip install something
  2. Configure to use the plugin. You do this by editing (or creating) your .coveragerc file, as described in Configuration files. The plugins setting indicates your plugin. It’s a list of importable module names of plugins:

    plugins =
  3. If the plugin needs its own configuration, you can add those settings in the .coveragerc file in a section named for the plugin:

    option1 = True
    option2 =

    Check the documentation for the plugin to see if it takes any options, and what they are.

  4. Run your tests with as you usually would. If you get a message like “Plugin file tracers (something.plugin) aren’t supported with PyTracer,” then you don’t have the C extension installed.

Available plugins

Some plugins you might find useful: