Humblebundle.com has an awesome Python book bundle available as PDF and EPUB and all are DRM-free! All books are in English and the complete bundle has 24 books from Pack Publishing. I already have in as real, paper Book Mastering Python Networking by Eric Chou and Django 3 by Example by Antonio Mele and those books are really good.
Other books in this bundle are for example:
Exploratory Data Analysis with Python
Artificial Intelligence with Python
Machine Learning with scikit-learn and Scientific Python Toolkits
The book bundle is available at Humblebundle.com at The Ultimate Python Bookshelf by Packt