I learned via Udacity's course (been using Python at work for 5 years now) but I recommend others to use "Learn Python The Hard Way" For Data Science I'd recom

I learned via Udacity's course (been using Python at work for 5 years now) but I recommend others to use "Learn Python The Hard Way" For Data Science I'd recommend DataCamp which ChaseDehan recommended or Panda's Documents (especially the cookbook) are very useful. Pandas is 80% of what you need to know to be a king at Data Analysis.