How Sets and Dictionaries Work

Underlying Python sets and dictionaries is something called a hash table. We aren't going to discuss how these work in this Nanodegree because you don't need to know how they work in order to use them. But if you're interested in learning more you should take a look at:

• Udacity videos on hash tables. The link is to the first video in a series of videos about how hash tables work.
• Wikipedia article on hash tables.