Free lab Real Python 3. Zero installs. Your code stays in this browser. Open the playground

Data Structures

Real programs manage collections of data. Master Python's four built-in containers, slicing, and the elegant comprehension syntax that sets Python apart from every other language.

Beginner 6 lessons 175 XP ~85 min
Real work, not toy syntax

What this course helps you build

Each lesson connects the Python concept to work you could automate, analyse or ship.

Shopping basket

Model products, quantities, prices and stock using lists and dictionaries.

Survey analyser

Count responses, remove duplicates and identify the most common answers.

Student gradebook

Navigate nested records and calculate results for an entire class.

API response explorer

Safely extract the exact fields you need from real JSON-shaped data.

Course roadmap

  1. 1

    Lists: Your First Collection Start here

    12 min 20 XP 2 quiz 1 challenge
    Start →
  2. 2

    Slicing & List Methods

    14 min 25 XP 2 quiz 1 challenge
    Start →
  3. 3

    Dictionaries: Key → Value

    15 min 30 XP 2 quiz 1 challenge
    Start →
  4. 4

    Tuples & Sets

    12 min 25 XP 2 quiz 1 challenge
    Start →
  5. 5

    List Comprehensions

    14 min 30 XP 2 quiz 1 challenge
    Start →
  6. 6

    Mini Project: Gradebook

    18 min 45 XP 1 quiz 1 challenge
    Start →

You can take every lesson without an account — but create a free account to save progress, earn XP and unlock achievements.

Your next ten minutes

Write Python that does something useful.

Start free. No install, no card, no passive video marathon.

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