Learning Python is a tutorial book for the Python programming language, and is published by O'Reilly Media. The first (1999) and second (2003) editions were written by Mark Lutz and David Ascher, and covers Python 1.5 and 2.3, respectively. The third (2007) edition was written solely by Mark Lutz, and covers Python 2.5. The fourth (2009) and fifth (2013) editions were both written by Mark Lutz. The fourth edition covers Python 2.6 and 3.x, and the fifth edition covers Python 2.7 and Python 3.3.