Release Process#

This document describes the current release process. It may or may not change in the future.

Before the release#

Update the changelog ( with all relevant changes that happened after the last release. If the last release was tagged v1.2.0, you can use the following URL to see all commits that got merged into main since then:

GitHub: Compare v1.2.0…main

Thank the authors who contributed since the last release. This command helps extract them: git log –format=’%aN’ v1.1.0..HEAD | sort -u. The command has the same order as git shortlog.

During the release#

The version number of a release is stated in pyproject.toml. To release a new version of Flower, the following things need to happen (in that order):

  1. Update the section header Unreleased to contain the version number and date for the release you are building. Create a pull request with the change.

  2. Tag the release commit with the version number as soon as the PR is merged: git tag v0.12.3, then git push --tags

  3. Build the release with ./dev/, then publish it with ./dev/

  4. Create an entry in GitHub releases with the release notes for the previously tagged commit and attach the build artifacts (.whl and .tar.gz).

After the release#

Create a pull request which contains the following changes:

  1. Increase the minor version in pyproject.toml by one.

  2. Update all files which contain the current version number if necessary.

  3. Add a new Unreleased section in

Merge the pull request on the same day (i.e., before a new nighly release gets published to PyPI).

Publishing a pre-release#

Pre-release naming#

PyPI supports pre-releases (alpha, beta, release candiate). Pre-releases MUST use one of the following naming patterns:



  • Release candiate (RC): MAJOR.MINOR.PATCHrcN

Examples include:

  • 1.0.0a0

  • 1.0.0b0

  • 1.0.0rc0

  • 1.0.0rc1

This is in line with PEP-440 and the recommendations from the Python Packaging Authority (PyPA):

Note that the approach defined by PyPA is not compatible with SemVer 2.0.0 spec, for details consult the Semantic Versioning Specification (specifically item 11 on precedence).

Pre-release classification#

Should the next pre-release be called alpha, beta, or release candidate?

  • RC: feature complete, no known issues (apart from issues that are classified as “won’t fix” for the next stable release) - if no issues surface this will become the next stable release

  • Beta: feature complete, allowed to have known issues

  • Alpha: not feature complete, allowed to have known issues