Licences and attribution

This page lists everything the site shows or loads that somebody else wrote, and the terms of the course itself.

The course

Code samples MIT. Text and figures CC BY-NC-SA 4.0 (share and adapt non-commercially, with credit, under the same terms).

The Python you write and the reference solutions shown in the lessons are yours to use, at work or anywhere else.

Tau, the reference implementation

Every "How Tau does it" block quotes a few lines of Tau, an independent open-source coding-agent harness. Each excerpt names its file and line range and links to those lines at one pinned commit, so you can check it. Tau is distributed under the MIT License, reproduced here in full as that licence asks.

This site is not part of Tau and is not endorsed by its authors.

MIT License

Copyright (c) 2026 Alejandro AO

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Fonts

Both typefaces are served from this site, not from a font service, and both are licensed under the SIL Open Font License, Version 1.1. The full licence text of both families ships beside the font files.

• Newsreader. Copyright 2020 The Newsreader Project Authors (github.com/productiontype/Newsreader).
• IBM Plex Mono. Copyright 2017 IBM Corp., with Reserved Font Name "Plex" (github.com/IBM/plex).

Pyodide, the Python runtime

When you first press Run, your browser downloads Pyodide from the jsDelivr CDN. This site does not host or modify it. Pyodide is licensed under the Mozilla Public License 2.0. It contains CPython, which is distributed under the Python Software Foundation License.

Code editor

The editor in every exercise is a plain text area with the course's own highlighting underneath, part of this site's code. No third-party editor is loaded: Pyodide is the only third-party code that runs here.

Contact

If something here is wrong or missing, please say so.