You've learned dictionaries. Here's what we covered: Creating dictionaries with {} and accessing with [] or get()
Adding, modifying, and removing entries
Iterating with keys(), values(), and items()
The counting pattern for frequency problems
The grouping pattern for organizing data
Dictionary comprehensions for concise building
The "seen so far" pattern for algorithm optimization Dictionaries are one of Python's most useful features. With lists, functions, and dictionaries, you can solve most programming problems. You're now ready for real-world challenges.