Well, there are great ressources for advanced Python programming :
- Dive Into Python (read it for free)
- Online python cookbooks (e.g. here and there)
- O'Reilly's Python Cookbook (see amazon)
- A funny riddle game : Python Challenge
Here is a list of subjects you must master if you want to write "Python" on your resume :
- list comprehensions
- iterators and generators
- decorators
They are what make Python such a cool language (with the standard library of course, that I keep discovering everyday).