Efficient Linux at the Command Line
Daniel J. Barrett
Attack Surface Management
Ron Eddings and MJ Kaufmann
Firewalls Don't Stop Dragons
Carey Parker
Learning Modern Linux
Michael Hausenblas
Practical Cryptography in Python
Seth James Nielson & Christopher K. Monson
Python Playground
Mahesh Venkitachalam
Automate the Boring Stuff with Python: Practical Programming ...
Al Sweigart