Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

You can contribute in many ways:

Types of Contributions

Report Bugs

Report bugs at

If you are reporting a bug, please include:

  • Your operating system name and version.

  • Any details about your local setup that might be helpful in troubleshooting.

  • Detailed steps to reproduce the bug.

Fix Bugs

Look through the GitHub issues for bugs. Anything tagged with “bug” is open to whoever wants to implement it.

Implement Features

Look through the GitHub issues for features. Anything tagged with “feature” is open to whoever wants to implement it.

Write Documentation

lim could always use more documentation, whether as part of the official docs, in docstrings, or even on the web in blog posts, articles, and such.

Documentation includes comments in source code. Sphinx is used to produce some of the documentation for lim from source code itself. Follow the Google Python Style Guide, for example its guidance on use of comments and docstrings.

Submit Feedback

The best way to send feedback is to file an issue at

If you are proposing a feature:

  • Explain in detail how it would work.

  • Keep the scope as narrow as possible, to make it easier to implement.

  • Remember that this is a volunteer-driven project, and that contributions are welcome :)

Get Started!

Ready to contribute? Here’s how to set up lim for local development.

  1. Fork the lim repo on GitHub.

  2. Clone your fork locally:

    $ git clone
  3. Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed, this is how you set up your fork for local development:

    $ mkvirtualenv lim
    $ cd lim/
    $ python develop

    If you are using an IDE like Visual Studio Code, and you want to add new subcommands in the file, you will need to install the package into the virtualenv first in order for cliff to dynamically load the functions. Run make install-active to do this. You can then run the debugger and the new subcommands will load properly.

  4. Create a branch for local development:

    $ git checkout -b name-of-your-bugfix-or-feature

    Now you can make your changes locally.

  5. When you’re done making changes, check that your changes pass flake8, bandit, and other tests including testing other Python versions with tox:

    $ make test
  6. Commit your changes and push your branch to GitHub:

    $ git add .
    $ git commit -m "Your detailed description of your changes."
    $ git push origin name-of-your-bugfix-or-feature
  7. Submit a pull request through the GitHub website.

Pull Request Guidelines

Before you submit a pull request, check that it meets these guidelines:

  1. The pull request should include tests.

  2. If the pull request adds functionality, the docs should be updated. Put your new functionality into a cliff` class with a docstring and epilog text and/or add the feature description to the list in README.rst.

  3. The pull request should work for the environments listed in tox.ini.Check and make sure that the tests pass for all supported Python versions.


To run all tests, simply do make test.

To run a subset of tests for more fine grained development testing, do something like this:

$ workon lim
$ python -m unittest tests.test_ctu
Ran 24 tests in 0.519s