Thank you for your interest in this project! Please refer to the following sections on how to contribute code and bug reports.

Reporting bugs

At the moment, this project is run in the spare time of a single person (Wenzel Jakob) with very limited resources for issue tracker tickets. Thus, before submitting a question or bug report, please take a moment of your time and ensure that your issue isn't already discussed in the project documentation provided at

Assuming that you have identified a previously unknown problem or an important question, it's essential that you submit a self-contained and minimal piece of code that reproduces the problem. In other words: no external dependencies, isolate the function(s) that cause breakage, submit matched and complete C++ and Python snippets that can be easily compiled and run on my end.

Pull requests

Contributions are submitted, reviewed, and accepted using Github pull requests. Please refer to this article for details and adhere to the following rules to make the process as smooth as possible:

  • Make a new branch for every feature you're working on.
  • Make small and clean pull requests that are easy to review but make sure they do add value by themselves.
  • Add tests for any new functionality and run the test suite (make pytest) to ensure that no existing features break.
  • Please run flake8 and tools/ to check your code matches the project style. (Note that requires gawk.)
  • This project has a strong focus on providing general solutions using a minimal amount of code, thus small pull requests are greatly preferred.

Licensing of contributions

pybind11 is provided under a BSD-style license that can be found in the LICENSE file. By using, distributing, or contributing to this project, you agree to the terms and conditions of this license.

You are under no obligation whatsoever to provide any bug fixes, patches, or upgrades to the features, functionality or performance of the source code (“Enhancements”) to anyone; however, if you choose to make your Enhancements available either publicly, or directly to the author of this software, without imposing a separate written license agreement for such Enhancements, then you hereby grant the following license: a non-exclusive, royalty-free perpetual license to install, use, modify, prepare derivative works, incorporate into other computer software, distribute, and sublicense such enhancements or derivative works thereof, in binary and source code form.