Learn Python by writing real Python

Every exercise is run by real Python (CPython 3.14, compiled to WebAssembly), inside your browser, on your own device. The lessons follow the University of Helsinki's Python Programming MOOC, from your first print to classes, recursion, regular expressions and games with pygame, with their own explanations and exercises.

All 65 modules are online: 58 following the MOOC (Introduction to Programming and the Advanced Course in Programming) and 7 extra modules of Python Arena's own (Data structures and algorithms), with 276 steps and 828 challenges.

Module 1: Printing and comments
Module 2: Information from the user
Module 3: Variables and f-strings
Module 4: Arithmetic operations
Module 5: Conditional statements
Module 6: Programming terminology
Module 7: More conditionals
Module 8: Combining conditions
Module 9: Simple loops
Module 10: Loops with conditions
Module 11: Working with strings
Module 12: More loops
Module 13: Defining functions
Module 14: More functions
Module 15: Lists
Module 16: Definite iteration
Module 17: Print statement formatting
Module 18: More strings and lists
Module 19: More lists
Module 20: References
Module 21: Dictionary
Module 22: Tuple
Module 23: Reading files
Module 24: Writing files
Module 25: Handling errors
Module 26: Local and global variables
Module 27: Modules
Module 28: Randomness
Module 29: Times and dates
Module 30: Data processing
Module 31: Creating your own modules
Module 32: More Python features
Module 33: Objects and methods
Module 34: Defining classes
Module 35: Defining methods
Module 36: More examples of classes
Module 37: Objects and references
Module 38: Objects as attributes
Module 39: Encapsulation
Module 40: Class attributes
Module 41: Class hierarchies
Module 42: Access modifiers
Module 43: Object oriented programming techniques
Module 44: Developing a larger application
Module 45: List comprehensions
Module 46: More comprehensions
Module 47: Recursion
Module 48: More recursion examples
Module 49: Functions as arguments
Module 50: Generators
Module 51: Functional programming
Module 52: Regular expressions
Module 53: Pygame
Module 54: Animation
Module 55: Events
Module 56: More pygame techniques
Module 57: Game project
Module 58: Your own game
Module 59: Complexity and searching Extra
Module 60: Sorting algorithms Extra
Module 61: Hash tables Extra
Module 62: Trees and heaps Extra
Module 63: Graphs Extra
Module 64: Recursion and backtracking Extra
Module 65: Dynamic programming Extra
All modules

Practice: Deathmatch drills, the daily challenge and a placement quiz.

Interview prep: interview questions to drill, the modules on data structures and algorithms, which technique fits which problem, and what Python's operations cost.

Projects: larger programs built over several milestones.

Pro Track: after the course, projects to build on your own computer with Python and pytest tests.