Stage 2 · 30 min · Pro

Dictionaries (dict) and sets

Store data by key with dict, count frequencies, loop with items(), get(); remove duplicates with set.

Objectives

Create, read and update a dict
Use get() to avoid KeyError
Count frequencies with a dict
Use set to remove duplicates

This lesson is for Pro members

Phone books, score sheets by name, counting how often words appear: "key → value" data is everywhere. dict is the most used data structure in real-world Python.

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