Python Basics · Data Structures · Lesson 17 of 36
Dictionaries
Concept
Dictionaries
Dictionaries store key-value pairs, accessed by key instead of position.
.get("key") is a safer way to read a value than square brackets, since it returns None (or a default you choose) instead of raising an error when the key doesn't exist.
- Explain the core idea behind Dictionaries.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Dictionaries. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Create a dictionary representing a course with title and level keys.
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
Console