fixed formatting under Python section

free-programming-books.md

@@ -1356,8 +1356,8 @@ See also [TeX](#tex)
 * [A Beginner's Python Book](http://en.wikibooks.org/wiki/A_Beginner%27s_Python_Tutorial)
 * [A Bit of Python and Other Things](http://jessenoller.com/good-to-great-python-reads/)
 * [A Guide to Python's Magic Methods](http://www.rafekettler.com/magicmethods.html) - Rafe Kettler
-* [Building Skills in Object-Oriented Design (Python)](http://www.itmaybeahack.com/book/oodesign-python-2.1/latex/BuildingSkillsinOODesign.pdf)
-* [Building Skills in Python](http://www.itmaybeahack.com/book/python-2.6/latex/BuildingSkillsinPython.pdf)
+* [Building Skills in Object-Oriented Design (Python)](http://www.itmaybeahack.com/book/oodesign-python-2.1/latex/BuildingSkillsinOODesign.pdf) (PDF)
+* [Building Skills in Python](http://www.itmaybeahack.com/book/python-2.6/latex/BuildingSkillsinPython.pdf) (PDF)
 * [Byte of Python](http://www.swaroopch.com/notes/Python)
 * [Data Structures and Algorithms in Python](http://www.brpreiss.com/books/opus7/html/book.html)
 * [Dive into Python](http://www.diveintopython.net/) - Mark Pilgrim
@@ -1377,7 +1377,7 @@ See also [TeX](#tex)
 * [Learning to Program](http://www.freenetpages.co.uk/hp/alan.gauld/)
 * [Lectures on scientific computing with python](https://github.com/jrjohansson/scientific-python-lectures) - J.R. Johansson
 * [Making Games with Python & Pygame](http://inventwithpython.com/pygame/chapters/) - Al Sweigart
-* [Modeling Creativity: Case Studies in Python](http://www.clips.ua.ac.be/sites/default/files/modeling-creativity.pdf) - Tom D. De Smedt
+* [Modeling Creativity: Case Studies in Python](http://www.clips.ua.ac.be/sites/default/files/modeling-creativity.pdf) - Tom D. De Smedt (PDF)
 * [Natural Language Processing with Python](http://www.nltk.org/book)
 * [Non-Programmer's Tutorial for Python 2.6](http://en.wikibooks.org/wiki/Non-Programmer%27s_Tutorial_for_Python_2.6)
 * [Non-Programmer's Tutorial for Python 3](http://en.wikibooks.org/wiki/Non-Programmer%27s_Tutorial_for_Python_3)
@@ -1402,9 +1402,9 @@ See also [TeX](#tex)
 * [Test-Driven Web Development with Python](http://chimera.labs.oreilly.com/books/1234000000754/index.html)
 * [Text Processing in Python](http://gnosis.cx/TPiP/) - David Mertz
 * [The Art and Craft of Programming](http://beastie.cs.ua.edu/cs150/book/index.html)
-* [The Programming Historian](http://niche-canada.org/files/programming-historian-1.pdf) - William J. Turkel, Adam Crymble and Alan MacEachern
+* [The Programming Historian](http://niche-canada.org/files/programming-historian-1.pdf) - William J. Turkel, Adam Crymble and Alan MacEachern (PDF)
 * [Think Python](http://www.greenteapress.com/thinkpython/) - Allen B. Downey
-* [Web2py: Complete Reference Manual, 6th Edition (pre-release)](http://web2py.com/book) - HTML
+* [Web2py: Complete Reference Manual, 6th Edition (pre-release)](http://web2py.com/book) (HTML)
 * [Web2py: Complete Reference Manual, 6th Edition (pre-release)](https://dl.dropbox.com/u/18065445/web2py/web2py_manual_5th.pdf) (PDF)
 * [Welcome to Problem Solving with Algorithms and Data Structures](http://interactivepython.org/runestone/static/pythonds/index.html) - Brad Miller and David Ranum
 * [Wikibooks: Python Programming](http://en.wikibooks.org/wiki/Python_Programming)