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Python

A general-purpose language known for clear syntax and a huge standard library. The usual first language for data work, automation and backend services. This path has 18 lessons in reading order, from the basics to the ideas that come up in real code, with a runnable example in every lesson.

Beginner-friendlyRuns in your browser
lessons
17 lessons
exercises
9 exercises
interview questions
0 interview questions
challenges
3 challenges
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What Python is used for

  • Data science
  • Automation and scripting
  • Web backends
  • Machine learning

How examples are checked

Every example and every exercise solution was run with CPython 3.11 at build time; runs in your browser on CPython 3.14 (Pyodide). The Run buttons execute the same code on your device.

Learn

The Python learning path

Read in order: each lesson leans only on the ones before it. Every lesson ends with a small program to write and links to matching exercises.

Beginner

Beginner
  1. 1Python Syntax and Your First Program
  2. 2Variables in Python
  3. 3Data Types in Python
  4. 4Operators in Python
  5. 5Conditions: if, elif and else in Python
  6. 6Loops in Python: for and while
  7. 7Functions in Python
  8. 8Strings in Python
  9. 9Lists in Python

Intermediate

Intermediate
  1. 1Tuples in Python
  2. 2Sets in Python
  3. 3Dictionaries in Python
  4. 4Comprehensions in Python
  5. 5Modules and Imports in Python
  6. 6Reading and Writing Files in Python
  7. 7Exceptions and Error Handling in Python
  8. 8Inheritance in Python

See the full curriculum with descriptions →

Practice

Practise Python

9 exercises across 8 topics, each checked by running your program against test cases. Start with these:

All Python exercises

More

Go further

Coding challenges in Python

3 algorithmic problems with starter code and tests.

Python playground

Write and run Python in your browser with example snippets to start from.