[WIP] Python: yacht

python/yacht/.exercism/metadata.json

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+{"track":"python","exercise":"yacht","id":"1f7f5c0525554e33943447264159e72e","url":"https://exercism.io/my/solutions/1f7f5c0525554e33943447264159e72e","handle":"DmitryKokorin","is_requester":true,"auto_approve":false}

python/yacht/README.md

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+# Yacht
+
+# Score a single throw of dice in *Yacht*
+
+The dice game [Yacht](https://en.wikipedia.org/wiki/Yacht_(dice_game)) is from
+the same family as Poker Dice, Generala and particularly Yahtzee, of which it
+is a precursor. In the game, five dice are rolled and the result can be entered
+in any of twelve categories. The score of a throw of the dice depends on
+category chosen.
+
+## Scores in Yacht
+
+| Category | Score | Description | Example |
+| -------- | ----- | ----------- | ------- |
+| Ones | 1 × number of ones | Any combination	| 1 1 1 4 5 scores 3 |
+| Twos | 2 × number of twos | Any combination | 2 2 3 4 5 scores 4 |
+| Threes | 3 × number of threes | Any combination | 3 3 3 3 3 scores 15 |
+| Fours | 4 × number of fours | Any combination | 1 2 3 3 5 scores 0 |
+| Fives | 5 × number of fives| Any combination | 5 1 5 2 5 scores 15 |
+| Sixes | 6 × number of sixes | Any combination | 2 3 4 5 6 scores 6 |
+| Full House | Total of the dice | Three of one number and two of another | 3 3 3 5 5 scores 19 |
+| Four of a Kind | Total of the four dice | At least four dice showing the same face | 4 4 4 4 6 scores 16 |
+| Little Straight |  30 points | 1-2-3-4-5 | 1 2 3 4 5 scores 30 |
+| Big Straight | 30 points | 2-3-4-5-6 | 2 3 4 5 6 scores 30 |
+| Choice | Sum of the dice | Any combination | 2 3 3 4 6 scores 18 |
+| Yacht | 50 points | All five dice showing the same face | 4 4 4 4 4 scores 50 |
+
+If the dice do not satisfy the requirements of a category, the score is zero.
+If, for example, *Four Of A Kind* is entered in the *Yacht* category, zero
+points are scored. A *Yacht* scores zero if entered in the *Full House* category.
+
+## Task
+Given a list of values for five dice and a category, your solution should return
+the score of the dice for that category. If the dice do not satisfy the requirements
+of the category your solution should return 0. You can assume that five values
+will always be presented, and the value of each will be between one and six
+inclusively. You should not assume that the dice are ordered.
+
+
+## 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:
+
+```python
+raise Exception("Meaningful message indicating the source of the error")
+```
+
+## Running the tests
+
+To run the tests, run `pytest yacht_test.py`
+
+Alternatively, you can tell Python to run the pytest module:
+`python -m pytest yacht_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/yacht` 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](http://exercism.io/tracks/python/tests).
+
+## Source
+
+James Kilfiger, using wikipedia [https://en.wikipedia.org/wiki/Yacht_(dice_game)](https://en.wikipedia.org/wiki/Yacht_(dice_game))
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

python/yacht/yacht.py

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+"""
+This exercise stub and the test suite contain several enumerated constants.
+
+Since Python 2 does not have the enum module, the idiomatic way to write
+enumerated constants has traditionally been a NAME assigned to an arbitrary,
+but unique value. An integer is traditionally used because it’s memory
+efficient.
+It is a common practice to export both constants and functions that work with
+those constants (ex. the constants in the os, subprocess and re modules).
+
+You can learn more here: https://en.wikipedia.org/wiki/Enumerated_type
+"""
+
+from collections import Counter
+
+# Score categories.
+# Change the values as you see fit.
+YACHT = 0
+ONES = 1
+TWOS = 2
+THREES = 3
+FOURS = 4
+FIVES = 5
+SIXES = 6
+FULL_HOUSE = 7
+FOUR_OF_A_KIND = 8
+LITTLE_STRAIGHT = 9
+BIG_STRAIGHT = 10
+CHOICE = 11
+
+
+def _yacht(dice):
+    return 50*all(x == dice[0] for x in dice)
+
+
+def _ones(dice):
+    return Counter(dice)[1]
+
+
+def _twos(dice):
+    return 2*Counter(dice)[2]
+
+
+def _threes(dice):
+    return 3*Counter(dice)[3]
+
+
+def _fours(dice):
+    return 4*Counter(dice)[4]
+
+
+def _fives(dice):
+    return 5*Counter(dice)[5]
+
+
+def _sixes(dice):
+    return 6*Counter(dice)[6]
+
+
+def _full_house(dice):
+    c = Counter(dice)
+
+    if sorted(list(c.values())) != [2, 3]:
+        return 0
+
+    return sum(k*v for k, v in c.items())
+
+
+def _four_of_a_kind(dice):
+
+    c = Counter(dice)
+    keys = list(c.keys())
+    if c[keys[0]] >= 4:
+        return keys[0]*4
+    if c[keys[1]] >= 4:
+        return keys[1]*4
+    return 0
+
+
+def _little_straight(dice):
+    return 30*(sorted(dice) == [1, 2, 3, 4, 5])
+
+
+def _big_straight(dice):
+    return 30*(sorted(dice) == [2, 3, 4, 5, 6])
+
+
+def _choice(dice):
+    return sum(dice)
+
+
+_CATEGORIES = {YACHT: _yacht,
+               ONES: _ones,
+               TWOS: _twos,
+               THREES: _threes,
+               FOURS: _fours,
+               FIVES: _fives,
+               SIXES: _sixes,
+               FULL_HOUSE: _full_house,
+               FOUR_OF_A_KIND: _four_of_a_kind,
+               LITTLE_STRAIGHT: _little_straight,
+               BIG_STRAIGHT: _big_straight,
+               CHOICE: _choice}
+
+
+def score(dice, category):
+    return _CATEGORIES[category](dice)

python/yacht/yacht_test.py

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+import unittest
+
+import yacht
+
+# Tests adapted from `problem-specifications//canonical-data.json`
+
+
+class YachtTest(unittest.TestCase):
+    def test_yacht(self):
+        self.assertEqual(yacht.score([5, 5, 5, 5, 5], yacht.YACHT), 50)
+
+    def test_not_yacht(self):
+        self.assertEqual(yacht.score([1, 3, 3, 2, 5], yacht.YACHT), 0)
+
+    def test_ones(self):
+        self.assertEqual(yacht.score([1, 1, 1, 3, 5], yacht.ONES), 3)
+
+    def test_ones_out_of_order(self):
+        self.assertEqual(yacht.score([3, 1, 1, 5, 1], yacht.ONES), 3)
+
+    def test_no_ones(self):
+        self.assertEqual(yacht.score([4, 3, 6, 5, 5], yacht.ONES), 0)
+
+    def test_twos(self):
+        self.assertEqual(yacht.score([2, 3, 4, 5, 6], yacht.TWOS), 2)
+
+    def test_fours(self):
+        self.assertEqual(yacht.score([1, 4, 1, 4, 1], yacht.FOURS), 8)
+
+    def test_yacht_counted_as_threes(self):
+        self.assertEqual(yacht.score([3, 3, 3, 3, 3], yacht.THREES), 15)
+
+    def test_yacht_of_3s_counted_as_fives(self):
+        self.assertEqual(yacht.score([3, 3, 3, 3, 3], yacht.FIVES), 0)
+
+    def test_sixes(self):
+        self.assertEqual(yacht.score([2, 3, 4, 5, 6], yacht.SIXES), 6)
+
+    def test_full_house_two_small_three_big(self):
+        self.assertEqual(yacht.score([2, 2, 4, 4, 4], yacht.FULL_HOUSE), 16)
+
+    def test_full_house_three_small_two_big(self):
+        self.assertEqual(yacht.score([5, 3, 3, 5, 3], yacht.FULL_HOUSE), 19)
+
+    def test_two_pair_is_not_a_full_house(self):
+        self.assertEqual(yacht.score([2, 2, 4, 4, 5], yacht.FULL_HOUSE), 0)
+
+    def test_four_of_a_kind_is_not_a_full_house(self):
+        self.assertEqual(yacht.score([1, 4, 4, 4, 4], yacht.FULL_HOUSE), 0)
+
+    def test_yacht_is_not_a_full_house(self):
+        self.assertEqual(yacht.score([2, 2, 2, 2, 2], yacht.FULL_HOUSE), 0)
+
+    def test_four_of_a_kind(self):
+        self.assertEqual(yacht.score([6, 6, 4, 6, 6], yacht.FOUR_OF_A_KIND), 24)
+
+    def test_yacht_can_be_scored_as_four_of_a_kind(self):
+        self.assertEqual(yacht.score([3, 3, 3, 3, 3], yacht.FOUR_OF_A_KIND), 12)
+
+    def test_full_house_is_not_four_of_a_kind(self):
+        self.assertEqual(yacht.score([3, 3, 3, 5, 5], yacht.FOUR_OF_A_KIND), 0)
+
+    def test_little_straight(self):
+        self.assertEqual(yacht.score([3, 5, 4, 1, 2], yacht.LITTLE_STRAIGHT), 30)
+
+    def test_little_straight_as_big_straight(self):
+        self.assertEqual(yacht.score([1, 2, 3, 4, 5], yacht.BIG_STRAIGHT), 0)
+
+    def test_four_in_order_but_not_a_little_straight(self):
+        self.assertEqual(yacht.score([1, 1, 2, 3, 4], yacht.LITTLE_STRAIGHT), 0)
+
+    def test_no_pairs_but_not_a_little_straight(self):
+        self.assertEqual(yacht.score([1, 2, 3, 4, 6], yacht.LITTLE_STRAIGHT), 0)
+
+    def test_minimum_is_1_maximum_is_5_but_not_a_little_straight(self):
+        self.assertEqual(yacht.score([1, 1, 3, 4, 5], yacht.LITTLE_STRAIGHT), 0)
+
+    def test_big_straight(self):
+        self.assertEqual(yacht.score([4, 6, 2, 5, 3], yacht.BIG_STRAIGHT), 30)
+
+    def test_big_straight_as_little_straight(self):
+        self.assertEqual(yacht.score([6, 5, 4, 3, 2], yacht.LITTLE_STRAIGHT), 0)
+
+    def test_no_pairs_but_not_a_big_straight(self):
+        self.assertEqual(yacht.score([6, 5, 4, 3, 1], yacht.BIG_STRAIGHT), 0)
+
+    def test_choice(self):
+        self.assertEqual(yacht.score([3, 3, 5, 6, 6], yacht.CHOICE), 23)
+
+    def test_yacht_as_choice(self):
+        self.assertEqual(yacht.score([2, 2, 2, 2, 2], yacht.CHOICE), 10)
+
+
+if __name__ == "__main__":
+    unittest.main()