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rootulp's solution

to Scrabble Score in the Python Track

Published at Jul 13 2018 · 0 comments
Instructions
Test suite
Solution

Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Given a word, compute the scrabble score for that word.

Letter Values

You'll need these:

Letter                           Value
A, E, I, O, U, L, N, R, S, T       1
D, G                               2
B, C, M, P                         3
F, H, V, W, Y                      4
K                                  5
J, X                               8
Q, Z                               10

Examples

"cabbage" should be scored as worth 14 points:

  • 3 points for C
  • 1 point for A, twice
  • 3 points for B, twice
  • 2 points for G
  • 1 point for E

And to total:

  • 3 + 2*1 + 2*3 + 2 + 1
  • = 3 + 2 + 6 + 3
  • = 5 + 9
  • = 14

Extensions

  • You can play a double or a triple letter.
  • You can play a double or a triple word.

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 scrabble_score_test.py
  • Python 3.4+: pytest scrabble_score_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 scrabble_score_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/scrabble-score 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 the help page.

Source

Inspired by the Extreme Startup game https://github.com/rchatley/extreme_startup

Submitting Incomplete Solutions

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

scrabble_score_test.py

import unittest

from scrabble_score import score


# Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0

class ScrabbleScoreTest(unittest.TestCase):
    def test_lowercase_letter(self):
        self.assertEqual(score("a"), 1)

    def test_uppercase_letter(self):
        self.assertEqual(score("A"), 1)

    def test_valuable_letter(self):
        self.assertEqual(score("f"), 4)

    def test_short_word(self):
        self.assertEqual(score("at"), 2)

    def test_short_valuable_word(self):
        self.assertEqual(score("zoo"), 12)

    def test_medium_word(self):
        self.assertEqual(score("street"), 6)

    def test_medium_valuable_word(self):
        self.assertEqual(score("quirky"), 22)

    def test_long_mixed_case_word(self):
        self.assertEqual(score("OxyphenButazone"), 41)

    def test_english_like_word(self):
        self.assertEqual(score("pinata"), 8)

    def test_empty_input(self):
        self.assertEqual(score(""), 0)

    def test_entire_alphabet_available(self):
        self.assertEqual(score("abcdefghijklmnopqrstuvwxyz"), 87)


if __name__ == '__main__':
    unittest.main()
class Scrabble:

    LETTER_VALUES = {
        'a':  1, 'b':  3, 'c':  3, 'd':  2, 'e':  1, 'f':  4, 'g':  2, 'h':  4,
        'i':  1, 'j':  8, 'k':  5, 'l':  1, 'm':  3, 'n':  1, 'o':  1, 'p':  3,
        'q': 10, 'r':  1, 's':  1, 't':  1, 'u':  1, 'v':  4, 'w':  4, 'x':  8,
        'y':  4, 'z': 10
    }

    @classmethod
    def score(cls, word):
        if not cls.valid(word):
            return 0
        return sum([cls.LETTER_VALUES[c.lower()] for c in word])

    @classmethod
    def valid(cls, word):
        return word.isalpha()


def score(word):
    return Scrabble.score(word)

Community comments

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