Contributing¶

PyScaffold was started by Blue Yonder developers to help automating and standardizing the process of project setups. Nowadays it is a pure community project and you are very welcome to join in our effort if you would like to contribute.

Issue Reports¶

If you experience bugs or in general issues with PyScaffold, please file an issue report on our issue tracker.

Code Contributions¶

Submit an issue¶

Before you work on any non-trivial code contribution it’s best to first create an issue report to start a discussion on the subject. This often provides additional considerations and avoids unnecessary work.

Create an environment¶

Before you start coding we recommend to install Miniconda which allows to setup a dedicated development environment named pyscaffold with:

conda create -n pyscaffold python=3 six virtualenv pytest pytest-cov

Then activate the environment pyscaffold with:

source activate pyscaffold

Clone the repository¶

Create a Gitub account if you do not already have one.
Fork the project repository: click on the Fork button near the top of the page. This creates a copy of the code under your account on the GitHub server.

Clone this copy to your local disk:

git clone git@github.com:YourLogin/pyscaffold.git

Run python setup.py egg_info --egg-base . after a fresh checkout. This will generate some critically needed files. Typically after that, you should run python setup.py develop to be able run putup.
Install pre-commit:
```
pip install pre-commit
pre-commit install
```
PyScaffold project comes with a lot of hooks configured to automatically help the developer to check the code being written.
Create a branch to hold your changes:
```
git checkout -b my-feature
```
and start making changes. Never work on the master branch!
Start your work on this branch. When you’re done editing, do:
```
git add modified_files
git commit
```
to record your changes in Git, then push them to GitHub with:
```
git push -u origin my-feature
```
Please check that your changes don’t break any unit tests with:
```
python setup.py test
```
or even a more thorough test with tox after having installed tox with pip install tox. Don’t forget to also add unit tests in case your contribution adds an additional feature and is not just a bugfix.

To speed up running the tests, you can try to run them in parallel, using pytest-xdist. This plugin is already added to the test dependencies, so everything you need to do is adding -n auto or -n <NUMBER OF PROCESS> in the CLI. For example:
```
tox -- -n 15
```
Please have in mind that PyScaffold test suite is IO intensive, so using a number of processes slightly bigger than the available number of CPUs is a good idea.
Use flake8 to check your code style.
Add yourself to the list of contributors in AUTHORS.rst.
Go to the web page of your PyScaffold fork, and click “Create pull request” to send your changes to the maintainers for review. Find more detailed information creating a PR.
If you are submitting a change related to an existing continuous integration (CI) system template (e.g. travis, cirrus, or even tox and pre-commit), please consider first submitting a companion PR to PyScaffold’s ci-tester, with the equivalent files changes, so we are sure it works.

If you are proposing a new CI system template, please send us a link of a simple repository generated with your templates (a simple putup --<YOUR EXTENSION> ci-tester will do) and the CI logs for that repository.

This helps us a lot to control breaking changes that might appear in the future.

Release¶

As a PyScaffold maintainer following steps are needed to release a new version:

Make sure all unit tests on Cirrus-CI are green.
Tag the current commit on the master branch with a release tag, e.g. v1.2.3.
Clean up the dist and build folders with rm -rf dist build to avoid confusion with old builds and Sphinx docs.
Run python setup.py dists and check that the files in dist have the correct version (no .dirty or Git hash) according to the Git tag. Also sizes of the distributions should be less than 500KB, otherwise unwanted clutter may have been included.
Run twine upload dist/* and check that everything was uploaded to PyPI correctly.

Troubleshooting¶

I’ve got a strange error related to versions in test_update.py when executing the test suite or about an entry_point that cannot be found.

Make sure to fetch all the tags from the upstream repository, the command git describe --abbrev=0 --tags should return the version you are expecting. If you are trying to run the CI scripts in a fork repository, make sure to push all the tags. You can also try to remove all the egg files or the complete egg folder, i.e. .eggs, as well as the *.egg-info folders in the src folder or potentially in the root of your project. Afterwards run python setup.py egg_info --egg-base . again.