Package releasing made easy: zest.releaser overview and installation¶
zest.releaser is collection of command-line programs to help you automate the task of releasing a Python project.
It does away with all the boring bits. This is what zest.releaser automates for you:
- It updates the version number. The version number can either be in
version.txtor in a
__versions__attribute in a Python file or in
setup.cfg. For example, it switches you from
0.3.dev0(current development version) to
0.4.dev0(new development version).
- It updates the history/changes file. It logs the release date on release and adds a new heading for the upcoming changes (new development version).
- It tags the release. It creates a tag in your version control system named after the released version number.
- It optionally uploads a source release to PyPI. It will only do this if the package is already registered there (else it will ask, defaulting to ‘no’); zest releaser is careful not to publish your private projects!
Most important URLs¶
First the three most important links:
Compatibility / Dependencies¶
zest.releaser works on Python 3.6+, including PyPy3.
Tested until Python 3.10, but see
tox.ini for the canonical place for that.
To be sure: the packages that you release with
very well work on other Python versions: that totally depends on your
We depend on:
setuptoolsfor the entrypoint hooks that we offer.
coloramafor colorized output (some errors printed in red).
twinefor secure uploading via https to pypi. Plain setuptools doesn’t support this.
Since version 4.0 there is a
recommended extra that you can get by
zest.releaser[recommended] instead of
contains a few trusted add-ons that we feel are useful for the great majority
- wheel for creating a Python wheel that we upload to PyPI next to
the standard source distribution. Wheels are the new Python package
format. Create or edit
setup.cfgin your project (or globally in your
~/.pypirc) and create a section
create-wheel = yesto create a wheel to upload to PyPI. See http://pythonwheels.com for deciding whether this is a good idea for your package. Briefly, if it is a pure Python 2 or pure Python 3 package: just do it. If it is a pure Python 2 and a pure Python 3 project, it is known as a “universal” wheel, because one wheel can be installed on all implementations and versions of Python. If you indicate this in
setup.cfgwith the section
universal = 1, then we will automatically upload a wheel, unless
create-wheelis explicitly set to false.
- check-manifest checks your
MANIFEST.infile for completeness, or tells you that you need such a file. It basically checks if all version controlled files are ending up the the distribution that we will upload. This may avoid ‘brown bag’ releases that are missing files.
- pyroma checks if the package follows best practices of Python
packaging. Mostly it performs checks on the
setup.pyfile, like checking for Python version classifiers.
- readme_renderer to check your long description in the same way as pypi does. No more unformatted restructured text on your pypi page just because there was a small error somewhere. Handy.
Just a simple
pip install zest.releaser or
easy_install zest.releaser is
enough. If you want the recommended extra utilities, do a
Alternatively, buildout users can install zest.releaser as part of a specific project’s buildout, by having a buildout configuration such as:
[buildout] parts = scripts [scripts] recipe = zc.recipe.egg eggs = zest.releaser[recommended]
Version control systems: git¶
Of course you must have a version control system installed. Since version 7, zest.releaser only supports git.
If you use Subversion (svn), Mercurial (hg), Git-svn, or Bazaar (bzr), please use version 6. If you really want, you can probably copy the relevant parts from the old code to a new package, and release this as an add-on package for zest.releaser. I suspect that currently it would only work with a monkey patch. If you are planning something, please open an issue, and we can see about making this part pluggable.
Zest.releaser gives you four commands to help in releasing python packages. They must be run in a version controlled checkout. The commands are:
- prerelease: asks you for a version number (defaults to the current version minus a ‘dev’ or so), updates the setup.py or version.txt and the CHANGES/HISTORY/CHANGELOG file (with either .rst/.txt/.md/.markdown or no extension) with this new version number and offers to commit those changes to subversion (or bzr or hg or git).
- release: copies the the trunk or branch of the current checkout and
creates a version control tag of it. Makes a checkout of the tag in a
temporary directory. Offers to register and upload a source dist
of this package to PyPI (Python Package Index). Note: if the package has
not been registered yet, it will not do that for you. You must register the
package manually (
python setup.py register) so this remains a conscious decision. The main reason is that you want to avoid having to say: “Oops, I uploaded our client code to the internet; and this is the initial version with the plaintext root passwords.”
- postrelease: asks you for a version number (gives a sane default), adds a development marker to it, updates the setup.py or version.txt and the CHANGES/HISTORY/CHANGELOG file with this and offers to commit those changes to version control. Note that with git and hg, you’d also be asked to push your changes (since 3.27). Otherwise the release and tag only live in your local hg/git repository and not on the server.
- fullrelease: all of the above in order.
Note: markdown files should use the “underline” style of headings, not the
“atx” style where you prefix the headers with
There are some additional tools:
- longtest: small tool that renders a setup.py’s long description
and opens it in a web browser. This assumes an installed docutils
(as it needs
- lasttagdiff: small tool that shows the diff of the current branch with the last released tag. Handy for checking whether all the changes are adequately described in the changes file.
- lasttaglog: small tool that shows the log of the current branch since the last released tag. Handy for checking whether all the changes are adequately described in the changes file.
- addchangelogentry: pass this a text on the command line and it will add this as an entry in the changelog. This is probably mostly useful when you are making the same change in a batch of packages. The same text is used as commit message. In the changelog, the text is indented and the first line is started with a dash. The command detects it if you use for example a star as first character of an entry.
- bumpversion: do not release, only bump the version. A
development marker is kept when it is there. With
--featurewe update the minor version. With option
--breakingwe update the major version.