Effective Python (disclaimer) contains 59 mini-lessons on python best practices. This book is not for programming novices but is great for advancing your python skill or as a reference if you’re moving to python from another language.

I see Effective Python as a compliment to Python for Data Analysis, the latter covering scientific and statistical uses where alternatives include MATLAB or R, and the former covering general software problems where python takes the place of Java or Ruby. Of course those two fields are not mutually exclusive, after reading Effective Python I have a better understanding of what’s going on (or should be going on) behind the scenes of the python libraries I use.