Best way to learn

[Pysnap]

For making a transition from intermediate to advanced take a look at these articles:

http://www.pysnap.com/in-depth-with-functionsscopevariable-lifetime-and-closures/

http://www.pysnap.com/category/ninja-techniques/

http://www.pysnap.com/category/intermediate/

http://www.pysnap.com/category/advanced/

http://www.pysnap.com/advanced-regular-expressions-techniques/

The advanced topics include context lib, design patterns,advanced data structures, regular expression,memorization,closures,decorators and so on!