Python for Programmers

6. Dictionaries and Sets

Objectives

In this chapter, you’ll:

• Use dictionaries to represent unordered collections of key–value pairs.

• Use sets to represent unordered collections of unique values.

• Create, initialize and refer to elements of dictionaries and sets.

• Iterate through a dictionary’s keys, values and key–value pairs.

• Add, remove and update a dictionary’s key–value pairs.

• Use dictionary and set comparison operators.

• Combine sets with set operators and methods.

• Use operators in and not in to determine if a dictionary contains a key or a set contains a value.

• Use the mutable set operations to modify a set’s contents.

• Use comprehensions to create dictionaries and sets quickly and conveniently.

• Learn how to build dynamic visualizations. ...