Thanks for your interest in improving the book. This project welcomes contributions of every size.
Thinking in Python is licensed under CC BY-NC-ND 4.0. See LICENSE.md for the terms and what they mean for reproducing, printing, and republishing the book.
This book is hosted on Github and the tools there support contributions. You can either open an issue or make a pull request.
What can you contribute? Anything as small as spelling and grammatical corrections, and as large as a whole chapter. Research into new topics and creating examples takes me the most time, so if you know something already or are willing to figure it out, don't worry if your writing or programming isn't perfect. Contribute it and I will improve it.
If you make contributions, you must own the rights to your material and be able to place it under the book's license. Please don't contribute something unless you are sure this is the case (read your company's employment contract, which often specifies that anything you think of or create at any time of day or night belongs to your company).
By submitting a contribution, you agree that it will be distributed under the same CC BY-NC-ND 4.0 license as the rest of the book.