Question

which reference book is best for software engineering subject

Answer 1

This course is pretty good for software engineering. Although personally I prefer languages such as C# which are more strongly typed and have a far better editor, Python has a lot of material available online. Go to http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00-introduction-to-computer-science-and-programming-fall-2008/index.htm and give it a try.