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governance/reference/pti/python.rst

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Project Testing Interface: Python

Each python project must be able to do:

  • Unit tests for python2.7
  • Codestyle checks
  • Testing Coverage Report
  • Source Tarball Generation
  • Translations import/export and merge for translated projects
  • Documentation generation

Projects which are compatible with Python 3 must also be able to do:

  • Unit tests for python3.5

Specific commands

To drive the above tasks, the following commands should be supported in a clean tree:

  • tox -epy27
  • tox -epep8
  • tox -ecover
  • python setup.py sdist
  • python setup.py bdist_wheel
  • tox -evenv python setup.py build_sphinx

Projects that are translated should also support:

  • tox -evenv python setup.py extract_messages
  • tox -evenv python setup.py update_catalog

Projects which are compatible with Python 3 must also be able to do:

  • tox -epy35

Some basic prerequisites for test running (system packages, database configuration, custom filesystem types) are acceptable as long as they are documented in a visible location such as a CONTRIBUTING, TESTING, or README file in the root of the repository.

Requirements Listing

Each project should list its operations dependencies in requirements.txt and additional dependencies required for testing in test-requirements.txt. If there are requirements that are specific to python3 or pypy support, those may be listed in requirements.txt or test-requirements.txt using environment makers.

Constraints

The requirements project maintains a set of constraints with packages pinned to specific package versions that are known to be working. The goal is to ease the diagnosis of breakage caused by projects upstream to OpenStack and to provide a set of packages known to work together.

Projects may opt into using the constraints in one or more of their standard targets via their tox.ini configuration.

Virtual Environment Management

To support sensible testing across multiple python versions, we use tox config files in the projects.

unittest running

OpenStack uses testrepository and stestr as its test runner, which supports a number of things, most importantly to the expanded project is the subunit output stream collection. This is useful for aggregating and displaying test output. In support of that, the oslotest library is built on top of testtools, testscenarios and fixtures. The usage of the testrepository project is deprecated and things are being migrated to stestr which is an active and currently maintained fork of testrepository.

Project Configuration

All OpenStack projects use pbr for consistent operation of setuptools. To accomplish this, all setup.py files only contain a simple setup function that setup_requires on an unversioned pbr, and a directive to pass processing to the pbr library. Actual project configuration is then handled in setup.cfg.

Generated Files

ChangeLog and AUTHORS files are generated at setup.py sdist time. This is handled by pbr.

.mailmap files should exist where a developer has more than one email address or identity, and should map to the developer's canonical identity.

Translations

To support translations processing, projects should have a valid babel config. There should be a locale package inside of the top project module, and in that dir should be the $project.pot file. For instance, for nova, there should be nova/locale/nova.pot. Babel commands should be configured out output their .mo files in to $project/locale as well.

Documentation

In addition to the normal PTI pti-documentation requirements, Python projects should put the following into their setup.cfg so that python setup.py build_sphinx continues to work:

[build_sphinx]
source-dir = doc/source
build-dir = doc/build

It may be assumed that the project will be installed before Sphinx is run using pip install ..

As a convenience for developers, it is recommended that projects provide a docs environment for tox that will run either sphinx-build -b html doc/source doc/build or python setup.py build_sphinx.

The project infrastructure will not use tox -edocs to build the documentation. Therefore it is STRONGLY discouraged for people to put additional logic into the command section of that tox environment. Additional logic needed around Sphinx generation should go into Sphinx plugins.