Kestrel Exams Free and official
- The Python Tutorial. Part of the official documentation at docs.python.org. It is concise and always matches the current version.
If you want one book
Python Crash Course, 3rd edition
The first half teaches the basics. The second half builds three projects. It suits students who learn by making something work.
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Practise for free
Kestrel's Python practice app has free questions with explanations, and the Python guides cover each section of a first course. Free, with no ads and no account.