Developer guidelines


Any code contributions that are more than trivial typo fixes require a signed contributor agreement. Please see Becoming a Contributor for details.

Pull requests

Pull requests for bug fixes, features or documentation are always welcome. Here’s how you can make it easy to accept your contribution:

  • Please create branches in the package’s repository instead of forking the package. That way other contributors can help easily.

  • Respect the conventions you find in the package you’re contributing to. This includes code style, tools used to run and configure tests, the package structure and its management. Coordinate with other developers for that package before changing any of these.

  • Keep cosmetic and code changes apart. If necessary, put them in separate pull requests.

  • If your code is fixing a bug it should have unit tests that exercise the bug and pass with your fix.

  • Make sure all unit and functional tests pass before creating a pull request. Most repositories will have a tox.ini configuration file and you can run all tests at once using tox.

  • “vendoring in” of third-party code is not allowed unless all contributors to that code have also signed a contributor agreement.

Please wait for approval from at least one other contributor before merging your code, which you can do yourself.

Coding Standards

As a general rule, projects in our repositories abide by the following standards:

  • Code in Zope-related projects should generally conform to PEP 8 coding style. In particular, Python code should never exceed 80 columns. Existing code should be updated to this standard only conservatively, to ease integration of patches made against older releases.

  • Project master branches and all branches that are officially supported should be kept in “ready-to-release” state: all unit tests pass, changelogs are kept updated, etc.

  • All features and APIs should be fully documented using Sphinx.

  • Solid release management, including releases to PyPI corresponding to “pristine” tags, detailed change logs, etc.

While some older projects may not be completely in line with this culture, we are committed to moving them all closer with any change. As a corollary: if you are submitting a patch to a project in this repository, and you want to expedite its acceptance, ensure that your patch maintains or improves the target project’s conformance to these goals.

Package layout

Each project should consist of a single, top-level project folder in GitHub. Because we are mostly working on Python code here, projects are normally arranged as a distutils project, e.g.:

- README.txt
+ docs/
  - Makefile
  - index.rst
  - api.rst
  + .static/
  + .build/
  + .templates/
+ package/
  + subpacakge/
    + tests/
    + templates/

Many packages place the first-level package directory in a src subdirectory inside the checkout.

Running Tests using zc.buildout

Most projects in the Zope repository are already configured to support building in-place and running tests using zc.buildout.

$ git clone
$ cd Zope
$ python3 -m venv .
$ bin/pip install -U pip wheel zc.buildout
$ bin/buildout
$ bin/test