We are all part of this


Releasing packages to the Python Package Index can be partially automated for Jazzband projects. To achieve this, we require new or transfered projects to add the jazzband PyPI user as a maintainer role on PyPI.

Once that’s done, the roadies are able to set up the recommended continuous testing solution GitHub Actions to automatically do releases to a private and secure package index where Jazzband members can review the uploaded files and release them to PyPI on their own.


For security reasons we can’t grant the ability to release to PyPI to all Jazzband members but only to those who have shown significant contributions to the projects in question. All other Jazzband features (as of writing this) continue to be open to all Jazzband members.

To become a project lead, please also open a project lead issue.

In case no project lead(s) can be found for a project the roadies will act as surrogate leads and can be contacted to request a PyPI release on the behalf of the Jazzband members. Please open a PyPI Release ticket for that.

Why are there project leads?

While we strongly favor the idea of providing full access to the Jazzband projects to all members, we need to counter-balance security requirements with our open development process.

Otherwise a bad actor may be able to make releases that are not in line with our Code of Conduct or – even worse – contain malicious code.

We sincerely hope that the Jazzband members accept that trade-off. We are committed to unrestricted members. We’re all part of this.

In the following paragraphs we’ll explain how you can configure a Jazzband project to be semi-automatically released to PyPI whenever a new Git tag is pushed to its repository.


Since we’re currently aiming at Python projects primarily please make sure your project is able to be packaged as a Python package on PyPI. There is a great and extensive documentation in the Python Packaging Guide that should allow you to prepare your project accordingly.

We recommend using setuptools_scm for automatically deducing the version of the project package from Git – but setting the version manually in the setup.py works just the same.

Continuous Integration

Next you will want to set up the project to use GitHub Actions for continuous testing. Please refer to the Python specific documentation for how to accomplish that.

In addition we strongly recommend using tox-gh-actions if the project is using tox (which is also recommended).

Steps needed:

If you need a project release and you are not a project lead, you should create a pull request named: Prepare release of <project> <version> and make sure that everything is ready for the release (e.g. update AUTHORS, CHANGELOG, documentation, etc.), to makes it easy for a project lead to review and release.

If you are a project lead, when you are ready to do a release to PyPI simply make sure that everything is ready for the release you’d like (e.g. update AUTHORS, CHANGELOG, documentation, etc.), merge the release pull-request, tag it with git tag and push the code to GitHub with git push --tags. Alternatively, you can use the GitHub UI to create a GitHub release that will create the tag for you.

If all goes according to plan, GitHub Actions will run the test suite for the pushed tag, create release files, uploads it to the Jazzband site, for the lead members or roadies to review. They will be able to confirm the uploads and release them to PyPI individually.

Versions and code names

When tagging releases using Git you need to make sensible decisions about which version number you use.

Jazzband follows the semantic release versioning scheme in which “semantic” means “correct for when a computer sees it” – not “nice to read for a human”. Don’t hesitate to release 1.0, or 2.0 or 41.5.12 for that matter. Do a 1.0 release as soon as your project is used in a real world application.

If you’d like to make statements about the importance of your releases attach a human readable release code name to your public announcments. Choose a theme that will allow you to pick one for every release, e.g. cat names. Or city names. Tree names. Color names. Anything that has lots of names.


Happy to announce that we just released Useful Software 1.4!


Happy to announce the “Cello” release (1.4) of our Useful Software!

How to decide for the version number?

Given a version number BREAKING.FEATURE.FIX increment…

  1. BREAKING when you make a backward-incompatible change to existing APIs
  2. FEATURE when you add a new feature without breaking backward-compatibility
  3. FIX when you fix a bug in an existing feature