Some of Allen Downey's books are free. Here's Think Python (How to Think Like a Computer Scientist): https://www.greenteapress.com/thinkpython/thinkpython.pdf

Some of Allen Downey's books are free. Here's Think Python (How to Think Like a Computer Scientist): https://www.greenteapress.com/thinkpython/thinkpython.pdf https://www.greenteapress.com/thinkpython/thinkpython.pdf