Add new Python exercises

One of the easiest ways to add new exercises to the Python track is to translate them from other language tracks on Exercism. This page lists all of the problem specifications in the common pool of exercises which have not yet been implemented in Python.

The icon links to the language-independent description of the problem.

The icon links to the canonical test data.

We also link to all the implementations of each exercise in other languages, which you can use for inspiration.

Once you've picked an exercise, follow the instructions in this guide and submit your pull request to the Python track repository on GitHub.




Binary Search Tree

Insert and search for numbers in a binary tree.

Custom Set

Create a custom set type.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'

Bank Account

Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!


Implement an evaluator for a very simple subset of Forth


Implement a basic reactive system.

Simple Linked List

Write a simple linked list implementation that uses Elements and a List


Compute the result for a game of Hex / Polygon


Make a chain of dominoes.

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.


Creating a zipper for a binary tree.


Reparent a graph on a selected node

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Diffie Hellman

Diffie-Hellman key exchange.

Two Bucket

Given two buckets of different size, demonstrate how to measure an exact number of liters.

Error Handling

Implement various kinds of error handling and resource management


Refactor a Markdown parser

Sgf Parsing

Parsing a Smart Game Format string.

Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

Go Counting

Count the scored points on a Go board.


Implement the logic of the hangman game using functional reactive programming.


Refactor a ledger printer.

Lens Person

Use lenses to update nested records (specific to languages with immutable data).

Tree Building

Refactor a tree building algorithm.


Report network IO statistics