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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 git+ nox


A specific version of nox must be used for pipx development until nox issue 233 is resolved.

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 running 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 .travis.

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

To create a new release

  • update pipx's version in and regenerate documentation
  • make sure the changelog is updated

Finally, run

nox -s publish
nox -s publish_docs

and create a new release in GitHub.