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CONTRIBUTING.rst

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Contributing to Photutils

Reporting Issues

When opening an issue to report a problem, please try to provide a minimal code example that reproduces the issue. Also, please include details of the operating system and the Python, NumPy, Astropy, and Photutils versions you are using.

Contributing code

Contributions to Photutils are done via pull requests from GitHub users' forks of the Photutils repository. If you're new to this style of development, you'll want to read the Astropy Development documentation.

Once you open a pull request (which should be opened against the main branch, not against any other branch), please make sure that you include the following:

  • Code: the code you are adding, which should follow as much as possible the Astropy coding guidelines.

  • Tests: these are either tests to ensure code that previously failed now works (regression tests) or tests that cover as much as possible of the new functionality to make sure it doesn't break in the future. The tests are also used to ensure consistent results on all platforms, since we run these tests on many platforms/configurations. For more information about how to write tests, see the Astropy testing guidelines.

  • Documentation: if you are adding new functionality, be sure to include a description in the main documentation (in docs/). For more information, please see the detailed Astropy documentation guidelines.

  • Changelog entry: if you are fixing a bug or adding new functionality, you should add an entry to the CHANGES.rst file that includes the PR number and if possible the issue number (if you are opening a pull request you may not know this yet, but you can add it once the pull request is open). If you're not sure where to put the changelog entry, wait until a maintainer has reviewed your PR and assigned it to a milestone.

    You do not need to include a changelog entry for fixes to bugs introduced in the developer version and therefore are not present in the stable releases. In general, you do not need to include a changelog entry for minor documentation or test updates. Only user-visible changes (new features/API changes, fixed issues) need to be mentioned. If in doubt, ask the core maintainer reviewing your changes.

Checklist for Contributed Code

A pull request for a new feature will be reviewed to see if it meets the following requirements. For any pull request, a Photutils maintainer can help to make sure that the pull request meets the requirements for inclusion in the package.

Scientific Quality (when applicable)

  • Is the submission relevant to this package?
  • Are references included to the original source for the algorithm?
  • Does the code perform as expected?
  • Has the code been tested against previously existing implementations?

Code Quality

  • Are the Astropy coding guidelines followed?
  • Are there dependencies other than the Astropy core, the Python Standard Library, and NumPy?
    • Are additional dependencies handled appropriately?
    • Do functions and classes that require additional dependencies raise an ImportError if they are not present?

Testing

  • Are the Astropy testing guidelines followed?
  • Are the inputs to the functions and classes sufficiently tested?
  • Are there tests for any exceptions raised?
  • Are there tests for the expected performance?
  • Are the sources for the tests documented?
  • Are the tests that require an optional dependency marked as such?
  • Does "tox -e test" run without failures?

Documentation

  • Are the Astropy documentation guidelines followed?
  • Is there a docstring in the functions and classes describing:
    • What the code does?
    • The format of the inputs of the function or class?
    • The format of the outputs of the function or class?
    • References to the original algorithms?
    • Any exceptions which are raised?
    • An example of running the code?
  • Is there any information needed to be added to the docs to describe the function or class?
  • Does the documentation build without errors or warnings?
  • If applicable, has an entry been added into the changelog?

License

  • Is the Photutils license included at the top of the file?
  • Are there any conflicts with this code and existing codes?