Exercism exercises in Python.
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GascaK and cmccandless clock: update tests to v2.4.0 (#1629)
Fixes #1618
* Updated test suite to test for exactly negative 1 hour.
Latest commit 68a0ea2 Dec 12, 2018


Exercism Python Track

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Exercism exercises in Python

Contributing Guide

Please see the contributing guide

Working on the Exercises

We welcome both improvements to the existing exercises and new exercises. A list of missing exercise can be found here: https://github.com/exercism/python/issues/417#issuecomment-366040062


  • We use minimalistic stub files for all exercises (#272).
  • We use unittest (Python Standard Library) and no 3rd-party-framework.
  • We use the parameter order self.assertEqual(actual, expected) (#440).
  • We use context managers (with self.assertRaises(\<exception type\>):) for testing for exceptions (#477).
  • We use an established utility method to confirm that expected exceptions contain a non-empty message. This method must be included for any test class with an exception-based test case (#1080).
  • We use assertIs(actual, True) and assertIs(actual, False) rather than assertTrue(actual) or assertFalse(actual) (#419).
  • We use a comment string in the test file to reference the version of the exercise's canonical-data.json that tests were adapted from (wording can be found in: #784).


All exercises must be compatible with Python versions 2.7 and 3.4 upwards.

To test a single exercise (e.g., with Python 2.7):

python2.7 test/check-exercises.py [exercise-name]

To test all exercises (e.g., with Python 3):

python3 test/check-exercises.py

Code Style

The Python code in this repo is meant to follow the PEP8 style guide (a stylized version http://pep8.org).

This repo uses flake8 with default settings to enforce the coding standard.

CI build

This repo uses travis-ci in the following configuration: travis.yml

It will automatically check the code style, the problem configuration, and run the unittests with all supported Python versions.

Pull Requests

We ❤️ pull requests! We even 💖 them if they contain well written commit messages!

Please write the first line of your commit message in the following style:

exercise-name: Change some things

Please try to follow the The seven rules of a great Git commit message like to capitalize the subject line and use the imperative mood. If there are more details to add, put those into the body of the commit message.

If you're interested, Tim Pope even has an entire blog post on good commit messages.

If you're new to Git, take a look at this short guide.

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The Python logo is an unregistered trademark. We are using a derived logo with the permission of the Python Software Foundation.


This repository uses the MIT License.