🎉 Exercism Research is now launched. Help Exercism, help science and have some fun at research.exercism.io 🎉
Avatar of katrinleinweber

katrinleinweber's solution

to Pangram in the Python Track

Published at Aug 24 2019 · 0 comments
Test suite


This exercise has changed since this solution was written.

Determine if a sentence is a pangram. A pangram (Greek: παν γράμμα, pan gramma, "every letter") is a sentence using every letter of the alphabet at least once. The best known English pangram is:

The quick brown fox jumps over the lazy dog.

The alphabet used consists of ASCII letters a to z, inclusive, and is case insensitive. Input will not contain non-ASCII symbols.

Exception messages

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")

Running the tests

To run the tests, run the appropriate command below (why they are different):

  • Python 2.7: py.test pangram_test.py
  • Python 3.4+: pytest pangram_test.py

Alternatively, you can tell Python to run the pytest module (allowing the same command to be used regardless of Python version): python -m pytest pangram_test.py

Common pytest options

  • -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

Submitting Exercises

Note that, when trying to submit an exercise, make sure the solution is in the $EXERCISM_WORKSPACE/python/pangram directory.

You can find your Exercism workspace by running exercism debug and looking for the line that starts with Workspace.

For more detailed information about running tests, code style and linting, please see Running the Tests.


Wikipedia https://en.wikipedia.org/wiki/Pangram

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


import unittest

from pangram import is_pangram

# Tests adapted from `problem-specifications//canonical-data.json` @ v2.0.0

class PangramTest(unittest.TestCase):
    def test_empty_sentence(self):
        self.assertIs(is_pangram(""), False)

    def test_perfect_lower_case(self):
        self.assertIs(is_pangram("abcdefghijklmnopqrstuvwxyz"), True)

    def test_only_lower_case(self):
        self.assertIs(is_pangram("the quick brown fox jumps over the lazy dog"), True)

    def test_missing_the_letter_x(self):
            is_pangram("a quick movement of the enemy will jeopardize five gunboats"),

    def test_missing_the_letter_h(self):
        self.assertIs(is_pangram("five boxing wizards jump quickly at it"), False)

    def test_with_underscores(self):
        self.assertIs(is_pangram("the_quick_brown_fox_jumps_over_the_lazy_dog"), True)

    def test_with_numbers(self):
            is_pangram("the 1 quick brown fox jumps over the 2 lazy dogs"), True

    def test_missing_letters_replaced_by_numbers(self):
        self.assertIs(is_pangram("7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog"), False)

    def test_mixed_case_and_punctuation(self):
        self.assertIs(is_pangram('"Five quacking Zephyrs jolt my wax bed."'), True)

    def test_case_insensitive(self):
        self.assertIs(is_pangram("the quick brown fox jumps over with lazy FX"), False)

if __name__ == "__main__":
import string as s
from typing import Set, Any

ALL_LETTERS: Set[Any] = set(s.ascii_uppercase)

def is_pangram(sentence):
    return ALL_LETTERS.issubset(sentence.upper())

# adapted from https://exercism.io/tracks/python/exercises/pangram/solutions/66c0c33fd2774c6d9d032b16fae5034d

Community comments

Find this solution interesting? Ask the author a question to learn more.

What can you learn from this solution?

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.

  • What compromises have been made?
  • Are there new concepts here that you could read more about to improve your understanding?