chukong/programmers-guide — pull request #58 by darkdukey (2014-11-08 18:57:05+00:00)
Title: Refactor how ch 9 organized

1. Reorganized everything from easy to hard
2. Create a Advanced section and move the hard and not so useful concepts there.
3. Remove a lot of wordy paragraph and replaced with short and to the point instructions.
Besides that I think this chapter still needs a lot of polish.