Solve the zebra puzzle.
Each of the five houses is painted a different color, and their inhabitants are of different national extractions, own different pets, drink different beverages and smoke different brands of cigarettes.
Which of the residents drinks water? Who owns the zebra?
Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include a message.
To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
raise Exception, you should write:
raise Exception("Meaningful message indicating the source of the error")
To run the tests, run the appropriate command below (why they are different):
Alternatively, you can tell Python to run the pytest module (allowing the same command to be used regardless of Python version):
python -m pytest zebra_puzzle_test.py
-v: enable verbose output
-x: stop running tests on first failure
--ff: run failures from previous test before running other test cases
For other options, see
python -m pytest -h
Note that, when trying to submit an exercise, make sure the solution is in the
You can find your Exercism workspace by running
exercism debug and looking for the line that starts with
For more detailed information about running tests, code style and linting, please see the help page.
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
import unittest from zebra_puzzle import drinks_water, owns_zebra # Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0 class ZebraPuzzleTest(unittest.TestCase): def test_resident_who_drinks_water(self): self.assertEqual(drinks_water(), "Norwegian") def test_resident_who_owns_zebra(self): self.assertEqual(owns_zebra(), "Japanese") if __name__ == '__main__': unittest.main()
# Intentionally left blank
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.