# Contributing to Seldon Core¶

Before opening a pull request consider:

• Is the change important and ready enough to ask the community to spend time reviewing?

• Have you searched for existing, related issues and pull requests?

• Is the change being proposed clearly explained and motivated?

When you contribute code, you affirm that the contribution is your original work and that you license the work to the project under the project’s open source license. Whether or not you state this explicitly, by submitting any copyrighted material via pull request, email, or other means you agree to license the material under the project’s open source license and warrant that you have the legal authority to do so.

## Release notes¶

Our process to manage release notes is modelled after how the Kubernetes project handles them. This process can be separated into 2 separate phases:

• Adding notes on each PR. Happens at PR creation time.

• Compiling all PR notes before a release. Happens at release time.

### Adding notes on each PR¶

When a PR is created, a Prow / Lighthouse plugin will check if there is a populated release-note block in the PR body such as:

release-note
Some public-facing release note.



If there isn’t, the PR will be labelled as do-not-merge/release-note-label-needed. Note that to speed things up, the default PR template will create an empty release-notes block for you. For PRs that don’t need public-facing release notes (e.g. fixes on the integration tests), you can use the /release-note-none Prow command.

#### Conventions¶

There are a number of conventions that we can use so that the changes are more semantic. These are mainly based around keywords which will affect how the release notes will get displayed.

• Use the words Added, Changed, Fixed, Removed or Deprecated to describe the contents of the PR. For example:

release-note


• Use the expression Action required to describe breaking changes. For example:

release-note
Action required: The helm value createResources has been renamed
managerCreateResources.



### Compiling all PR notes before a release¶

At release time, there is a release-notes command which crawls over all the PRs between 2 particular tags (e.g. v1.1.0 to v1.2.0), extracting the release-notes blocks. These blocks can then be used to generate the final release notes.

## Coding conventions¶

We use pre-commit to handle a number of Git hooks which ensure that all changes to the codebase follow Seldon’s code conventions. It is recommended to set these up before making any change to the codebase. Extra checks down the line will stop the build if the code is not compliant to the style guide of each language in the repository.

To install it, follow the official instructions. Once installed, run:



### Python¶

We use pytest as our main test runner. However, to ensure that tests run on the same version of the package that final users will download from pip and pypi.org, we use tox on top of it. To install both (plus other required plugins), just run:

$make install_dev  Using tox we can run the entire test suite over different environments, isolated between them. You can see the different ones we currently use on the setup.cfg file. You can run your tests across all these environments using the standard make test mentioned above. Alternatively, if you want to pass any extra parameters, you can also run tox directly as: $ tox


One of the caveats of tox is that, as the number of environments grows, so does the time it takes to finish running the tests. As a solution, during local development it may be recommended to run pytest directly on your own environment. You can do so as:

\$ pytest


### End to End Tests¶

As part of Seldon Core’s test suite, we also run end to end tests. These spin up an actual Kubernetes cluster using Kind and deploy different SeldonDeployment and resources.