This book is mostly minimal examples in whatever Python library the author decided to use. There are some major gaps.

For example, the section on Python libraries doesn't even mention the most commonly used Python crypto library (cryptography): https://github.com/nakov/Practical-Cryptography-for-Develope...

Similarly, the Java section essentially mentions a single, obscure library besides the JCE and Bouncy Castle: https://github.com/nakov/Practical-Cryptography-for-Develope...

There's also no mention of libsodium besides a bullet list item.