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Thanks for your interest in contributing to pipx!

Running pipx From Source Tree

To run the pipx executable from your source tree during development, run pipx from the src directory:

python src/pipx --version

Running Tests


pipx uses an automation tool called nox for development, continuous integration testing, and various tasks.

nox defines tasks or "sessions" in which can be run with nox -s SESSION_NAME. Session names can be listed with nox -l.

Install nox for pipx development:

python -m pip install --user nox

Tests are defined as nox sessions. You can see all nox sessions with

nox -l

At the time of this writing, the output looks like this

>> nox -l
Sessions defined in /home/csmith/git/pipx/

* tests-3.6
* tests-3.7
* tests-3.8
- cover -> Coverage analysis
* lint
* docs
- develop-3.6
- develop-3.7
- develop-3.8
- build
- publish
- watch_docs
- publish_docs

Unit Tests

To run unit tests in Python3.7, you can run

nox -s tests-3.7


You can run a specific unit test by passing arguments to pytest, the test runner pipx uses:

nox -s tests-3.8 -- -k EXPRESSION

EXPRESSION can be a test name, such as

nox -s tests-3.8 -- -k test_uninstall

Coverage errors can usually be ignored when only running a subset of tests.

Lint Tests

nox -s lint

Testing pipx on Continuous Integration builds

When you push a new git branch, tests will automatically be run against your code as defined in .github/workflows/on-push.yml.

Building Documentation

pipx autogenerates API documentation, and also uses templates.

When updating pipx docs, make sure you are either modifying a file in the templates directory, or the docs directory. If in the docs directory, make sure the file was not autogenerated from the templates directory. Autogenerated files have a note at the top of the file.

You can generate the documentation with

nox -s docs

This will capture CLI documentation for any pipx argument modifications, as well as generate templates to the docs directory.

To preview changes, including live reloading, open another terminal and run

nox -s watch_docs

Publishing Doc Changes to GitHub pages

nox -s publish_docs

Releasing New pipx Versions


  • Update pipx's version in src/pipx/ to the new version
  • Make sure the changelog is updated
    • Put the version of the new release as the header for the latest block of changes (instead of "dev").
    • Make sure all notable changes are listed.
  • Regenerate documentation.


To publish to PyPI: From a clone of the main pipxproject pipx repo (not a fork), run

nox -s publish

Additionally, create a new release in GitHub.


  • Update pipx's version in src/pipx/ by adding a suffix "dev0" for unreleased development.
  • Update the changelog to start a new section at the top entitled dev