How we teach and verify
Our approach to explanations, exercises and corrections.
Small connected steps
Lessons introduce concepts in a deliberate sequence with examples that you can edit. Every page points you to the earlier knowledge it assumes.
Working code and clear limits
We test example outputs and review the presentation and teaching. Browser Python runs on your device, within browser capabilities. File-system, Windows and hardware tasks need local execution.
Learn by changing things
Try altering example input, experimenting with mistakes and reading the resulting errors. The playground is there for your own Python, not just for predefined examples.
Corrections
If something looks wrong, send the lesson identifier, example number, the behaviour you observed and what you expected. Please do not include passwords, private files or tokens.
Human–AI collaboration
The materials are developed with AI assistance and human review. Automated tests are useful evidence, but cannot prove every explanation is clear or every program suits every environment.