add Hands-on Python 3 Tutorial as a book resource

books/free-programming-books-langs.md

@@ -1887,6 +1887,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Google's Python Style Guide](https://google.github.io/styleguide/pyguide.html)
 * [Hadoop with Python](https://www.oreilly.com/learning/hadoop-with-python) - Zachary Radtka, Donald Miner
 * [Hands-On Natural Language Processing with Python](https://www.packtpub.com/free-ebook/hands-on-natural-language-processing-with-python/9781789139495) - Rajesh Arumugam, Rajalingappaa Shanmugamani (Packt account *required*)
+* [Hands-on Python 3 Tutorial](https://anh.cs.luc.edu/python/hands-on/3.1/handsonHtml/index.html) - Dr. Andrew N. Harrington (HTML)
 * [Hitchhiker's Guide to Python!](http://docs.python-guide.org/en/latest/) (2.6)
 * [How to Code in Python 3](https://assets.digitalocean.com/books/python/how-to-code-in-python.pdf) - Lisa Tagliaferri (PDF)
 * [How to Make Mistakes in Python](http://www.oreilly.com/programming/free/files/how-to-make-mistakes-in-python.pdf) - Mike Pirnat (PDF) (1st edition)