Packt's Python books updated (#3491)

* New Python books from Packt

* Fixed alphabetical order

free-programming-books.md

@@ -2135,7 +2135,6 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Automate the Boring Stuff](http://automatetheboringstuff.com/chapter0/) - Al Sweigart
 * [Biopython](http://biopython.org/DIST/docs/tutorial/Tutorial.pdf) (PDF)
 * [Build applications in Python the antitextbook](http://github.com/thewhitetulip/build-app-with-python-antitextbook) (3.x) (HTML, PDF, EPUB, Mobi)
-* [Building Machine Learning Systems with Python](https://www.packtpub.com/packt/free-ebook/python-machine-learning-algorithms) - Willi Richert & Luis Pedro Coelho, Packt. (email address *requested*, not required)
 * [Building Skills in Object-Oriented Design (Python)](http://www.itmaybeahack.com/book/oodesign-python-2.1/latex/BuildingSkillsinOODesign.pdf) (PDF) (2.1.1)
 * [Building Skills in Python](http://www.itmaybeahack.com/book/python-2.6/latex/BuildingSkillsinPython.pdf) (PDF) (2.6)
 * [Code Like a Pythonista: Idiomatic Python](http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html)
@@ -2164,8 +2163,8 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Invent Your Own Computer Games With Python](http://inventwithpython.com/chapters/) - Al Sweigart (3.1)
 * [Learn Python, Break Python](http://learnpythonbreakpython.com)
 * [Learn Python in Y minutes](https://learnxinyminutes.com/docs/python/)
+* [Learn Python Programming, Second Edition](https://www.packtpub.com/free-ebooks/learn-python-programming-second-edition) - Fabrizio Romano (Packt account *required*)
 * [Learn to Program Using Python](https://www.ida.liu.se/~732A47/literature/PythonBook.pdf) - Cody Jackson (PDF)
-* [Learning Python](https://www.packtpub.com/packt/free-ebook/learning-python) - Fabrizio Romano, Packt. (email address *requested*, not required)
 * [Learning to Program](http://www.alan-g.me.uk)
 * [Lectures on scientific computing with python](https://github.com/jrjohansson/scientific-python-lectures) - J.R. Johansson (2.7)
 * [Making Games with Python & Pygame](http://inventwithpython.com/pygame/chapters/) - Al Sweigart (2.7)
@@ -2193,6 +2192,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Python in Education](http://www.oreilly.com/programming/free/python-in-education.csp) (email address *requested*, not required)
 * [Python in Hydrology](http://www.greenteapress.com/pythonhydro/pythonhydro.html) - Sat Kumar Tomer
 * [Python Koans](https://github.com/gregmalcolm/python_koans) (2.7 or 3.x)
+* [Python Machine Learning By Example](https://www.packtpub.com/free-ebooks/python-machine-learning-example) - Yuxi (Hayden) Liu (Packt account *required*)
 * [Python Module of the Week](https://pymotw.com/3/) (3.x)
   * [Python Module of the Week](https://pymotw.com/2/) (2.x)
 * [Python Notes for Professionals](http://books.goalkicker.com/PythonBook/) - Compiled from StackOverflow documentation (3.x)