Contributing to NumPy — NumPy v2.6.dev0 Manual

Not a coder? Not a problem! NumPy is multi-faceted, and we can use a lot of help. These are all activities we’d like to get help with (they’re all important, so we list them in alphabetical order):
Code maintenance and development
Community coordination
Developing educational content & narrative documentation
Website design and development
Writing technical documentation
We understand that everyone has a different level of experience, also NumPy is a pretty well-established project, so it’s hard to make assumptions about an ideal “first-time-contributor”. So, that’s why we don’t mark issues with the “good-first-issue” label. Instead, you’ll find issues labeled “Sprintable”. These issues can either be:
Easily fixed when you have guidance from an experienced contributor (perfect for working in a sprint).
A learning opportunity for those ready to dive deeper, even if you’re not in a sprint.
Additionally, depending on your prior experience, some “Sprintable” issues might be easy, while others could be more challenging for you.
The rest of this document discusses working on the NumPy code base and documentation. We’re in the process of updating our descriptions of other activities and roles. If you are interested in these other activities, please contact us! You can do this via the numpy-discussion mailing list, or on GitHub (open an issue or comment on a relevant issue). These are our preferred communication channels (open source is open by nature!), however if you prefer to discuss in a more private space first, you can do so on Slack (see numpy.org/contribute for details).
Here’s the short summary, complete TOC links are below:
If you are a first-time contributor:
Go to numpy/numpy and click the “fork” button to create your own copy of the project.
Clone the project to your local computer:
Change the directory:
Add the upstream repository:
Now, git remote -v will show two remote repositories named:
upstream, which refers to the numpy repository
origin, which refers to your personal fork
Pull the latest changes from upstream, including tags:
Initialize numpy’s submodules:
Develop your contribution:
Create a branch for the feature you want to work on. Since the branch name will appear in the merge message, use a sensible name such as ‘linspace-speedups’:
Commit locally as you progress (git add and git commit) Use a properly formatted commit message, write tests that fail before your change and pass afterward, run all the tests locally. Be sure to document any changed behavior in docstrings, keeping to the NumPy docstring standard.
To submit your contribution:
Push your changes back to your fork on GitHub:
Go to GitHub. The new branch will show up with a green Pull Request button. Make sure the title and message are clear, concise, and self- explanatory. Then click the button to submit it.
Note that non-maintainers may only have two non-draft pull requests open for review at a time. See Open pull request limit for details and how to be allowed more open pull requests.
If your commit introduces a new feature or changes functionality, post on the mailing list to explain your changes. For bug fixes, documentation updates, etc., this is generally not necessary, though if you do not get any reaction, do feel free to ask for review.
Reviewers (the other developers and interested community members) will write inline and/or general comments on your Pull Request (PR) to help you improve its implementation, documentation and style. Every single developer working on the project has their code reviewed, and we’ve come to see it as friendly conversation from which we all learn and the overall code quality benefits. Therefore, please don’t let the review discourage you from contributing: its only aim is to improve the quality of project, not to criticize (we are, after all, very grateful for the time you’re donating!). See our Reviewer Guidelines for more information.
To update your PR, make your changes on your local repository, commit, run tests, and only if they succeed push to your fork. As soon as those changes are pushed up (to the same branch as before) the PR will update automatically. If you have no idea how to fix the test failures, you may push your changes anyway and ask for help in a PR comment.
Various continuous integration (CI) services are triggered after each PR update to build the code, run unit tests, measure code coverage and check coding style of your branch. The CI tests must pass before your PR can be merged. If CI fails, you can find out why by clicking on the “failed” icon (red cross) and inspecting the build and test log. To avoid overuse and waste of this resource, test your work locally before committing.
A PR must be approved by at least one core team member before merging. Approval means the core team member has carefully reviewed the changes, and the PR is ready for merging.
Beyond changes to a functions docstring and possible description in the general documentation, if your change introduces any user-facing modifications they may need to be mentioned in the release notes. To add your change to the release notes, you need to create a short file with a summary and place it in doc/release/upcoming_changes. The file doc/release/upcoming_changes/README.rst details the format and filename conventions.
If your change introduces a deprecation, make sure to discuss this first on GitHub or the mailing list first. If agreement on the deprecation is reached, follow NEP 23 deprecation policy to add the deprecation.
Cross referencing issues
If the PR relates to any issues, you can add the text xref gh-xxxx where xxxx is the number of the issue to github comments. Likewise, if the PR solves an issue, replace the xref with closes, fixes or any of the other flavors github accepts.
In the source code, be sure to preface any issue or PR reference with gh-xxxx.
For a more detailed discussion, read on and follow the links at the bottom of this page.