Is this book code real?

Python Advanced astronaut ages teen+ From CS Unplugged

The problem

Write a function is_valid_isbn10(code). code is an ISBN-10 as text. It is valid when it has 10 characters, the first 9 are digits, the last is a digit or X (which means 10), and digit 1 times 10 + digit 2 times 9 + ... + digit 10 times 1 divides by 11. Give back True or False.

You will practice: check digits, validation, loops, remainder (%)

Solve it myself Guide me step by step

Your code

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Test results

What your code printed

CC BY-SA 4.0

Adapted from a CS Unplugged programming challenge by the University of Canterbury Computer Science Education Research Group, licensed CC BY-SA 4.0.

Original challenge · License: CC BY-SA 4.0

Changes: Rewritten in our own words as a function with tests, hints and steps, in Python and JavaScript, by Open Cosmos. This version is also CC BY-SA 4.0.