Need help understanding return statement

[python_lover]

Yes Zivoni, this is addition of two Vectors.

Thanks a lot every one for your help. 

Am quite an experienced programmer but some how Python is proving tricky for me. There are too many ways of achieving an outcome in it. 
Am looking for a book which will teach Python is a very simple way..checked books such a a byte of python, python the hard way, core python etc.. but still not able to get the grip.

Thanks,
PL