Update free-programming-books-langs.md (#6496)

* Update free-programming-books-langs.md

* Update free-programming-books-langs.md

* Update free-programming-books-langs.md

* Update free-programming-books-langs.md

* Added a book of PHP Essentials

* Update free-programming-books-langs.md

* Update free-programming-books-langs.md

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Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Updated the with commit
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update books/free-programming-books-langs.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

books/free-programming-books-langs.md

@@ -1845,6 +1845,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [A Beginner's Python Tutorial](https://en.wikibooks.org/wiki/A_Beginner%27s_Python_Tutorial) - Wikibooks
 * [A Byte of Python](https://python.swaroopch.com) (3.x) (HTML, PDF, EPUB, Mobi)
 * [A Guide to Python's Magic Methods](https://github.com/RafeKettler/magicmethods) - Rafe Kettler
+* [A Practical Introduction to Python Programming](https://www.brianheinold.net/python/) - Brian Heinold (HTML, PDF, Exercises sources)
 * [A Whirlwind Tour of Python](http://www.oreilly.com/programming/free/files/a-whirlwind-tour-of-python.pdf) - Jake VanderPlas (PDF) [(EPUB, MOBI)](http://www.oreilly.com/programming/free/a-whirlwind-tour-of-python.csp?download=yes)
 * [Architecture Patterns with Python](https://www.cosmicpython.com/book/preface.html) - Harry J.W. Percival & Bob Gregory (HTML)
 * [Automate the Boring Stuff with Python, 2nd Edition: Practical Programming for Total Beginners](https://automatetheboringstuff.com/2e/chapter0/) - Al Sweigart (3.8)
@@ -1939,7 +1940,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [SICP in Python](http://www-inst.eecs.berkeley.edu/~cs61a/sp12/book/) (3.2)
 * [Slither into Python: An introduction to Python for beginners](https://web.archive.org/web/20210411065902/https://www.slitherintopython.com/) (3.7) *(:card_file_box: archived)*
 * [Supporting Python 3: An In-Depth Guide](http://python3porting.com) (2.6 - 2.x & 3.1 - 3.x)
-* [Test-Driven Web Development with Python](http://www.obeythetestinggoat.com/pages/book.html) - Harry Percival (3.3 - 3.x)
+* [Test-Driven Web Development with Python: Obey the Testing Goat! using Django, Selenium and Javascript](http://www.obeythetestinggoat.com/pages/book.html) - Harry J.W. Percival (HTML) *(3.3 - 3.x)*
 * [Text Processing in Python](http://gnosis.cx/TPiP/) - David Mertz (2.3 - 2.x)
 * [The Big Book of Small Python Projects](https://inventwithpython.com/bigbookpython/) - Al Sweigart
 * [The Coder's Apprentice: Learning Programming with Python 3](http://www.spronck.net/pythonbook/) - Pieter Spronck (PDF) (3.x)