Python: twelve_days

python/twelve-days/.exercism/metadata.json

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+{"track":"python","exercise":"twelve-days","id":"249c305b4aeb433fa6a2406e07a3a5d0","url":"https://exercism.io/my/solutions/249c305b4aeb433fa6a2406e07a3a5d0","handle":"DmitryKokorin","is_requester":true,"auto_approve":false}

python/twelve-days/README.md

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+# Twelve Days
+
+Output the lyrics to 'The Twelve Days of Christmas'.
+
+```text
+On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.
+
+On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+```
+
+
+## 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 twelve_days_test.py`
+
+Alternatively, you can tell Python to run the pytest module:
+`python -m pytest twelve_days_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/twelve-days` 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
+
+Wikipedia [http://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)](http://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song))
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

python/twelve-days/twelve_days.py

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+from typing import List
+
+ORDINALS = ['first',
+            'second',
+            'third',
+            'fourth',
+            'fifth',
+            'sixth',
+            'seventh',
+            'eighth',
+            'ninth',
+            'tenth',
+            'eleventh',
+            'twelfth']
+
+GIFTS = ['a Partridge in a Pear Tree',
+         'two Turtle Doves',
+         'three French Hens',
+         'four Calling Birds',
+         'five Gold Rings',
+         'six Geese-a-Laying',
+         'seven Swans-a-Swimming',
+         'eight Maids-a-Milking',
+         'nine Ladies Dancing',
+         'ten Lords-a-Leaping',
+         'eleven Pipers Piping',
+         'twelve Drummers Drumming']
+
+
+def _get_gifts_by_day(day: int) -> str:
+
+    gift_str = ', '.join(reversed(GIFTS[1:day + 1]))
+
+    if gift_str:
+        gift_str += ', and '
+
+    gift_str += GIFTS[0]
+    return gift_str
+
+
+def recite(start_verse: int, end_verse: int) -> List[str]:
+
+    return [f'On the {ORDINALS[day]} day of Christmas my '
+            f'true love gave to me: {_get_gifts_by_day(day)}.'
+            for day in range(start_verse - 1, end_verse)]

python/twelve-days/twelve_days_test.py

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+import unittest
+
+from twelve_days import recite
+
+# Tests adapted from `problem-specifications//canonical-data.json`
+
+
+class TwelveDaysTest(unittest.TestCase):
+    def test_first_day_a_partridge_in_a_pear_tree(self):
+        expected = [
+            "On the first day of Christmas my true love gave to me: "
+            "a Partridge in a Pear Tree."
+        ]
+        print(recite(1,1))
+        print(expected)
+        self.assertEqual(recite(1, 1), expected)
+
+    def test_second_day_two_turtle_doves(self):
+        expected = [
+            "On the second day of Christmas my true love gave to me: "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(2, 2), expected)
+
+    def test_third_day_three_french_hens(self):
+        expected = [
+            "On the third day of Christmas my true love gave to me: "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(3, 3), expected)
+
+    def test_fourth_day_four_calling_birds(self):
+        expected = [
+            "On the fourth day of Christmas my true love gave to me: "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(4, 4), expected)
+
+    def test_fifth_day_five_gold_rings(self):
+        expected = [
+            "On the fifth day of Christmas my true love gave to me: "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(5, 5), expected)
+
+    def test_sixth_day_six_geese_a_laying(self):
+        expected = [
+            "On the sixth day of Christmas my true love gave to me: "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(6, 6), expected)
+
+    def test_seventh_day_seven_swans_a_swimming(self):
+        expected = [
+            "On the seventh day of Christmas my true love gave to me: "
+            "seven Swans-a-Swimming, "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(7, 7), expected)
+
+    def test_eighth_day_eight_maids_a_milking(self):
+        expected = [
+            "On the eighth day of Christmas my true love gave to me: "
+            "eight Maids-a-Milking, "
+            "seven Swans-a-Swimming, "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(8, 8), expected)
+
+    def test_ninth_day_nine_ladies_dancing(self):
+        expected = [
+            "On the ninth day of Christmas my true love gave to me: "
+            "nine Ladies Dancing, "
+            "eight Maids-a-Milking, "
+            "seven Swans-a-Swimming, "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(9, 9), expected)
+
+    def test_tenth_day_ten_lords_a_leaping(self):
+        expected = [
+            "On the tenth day of Christmas my true love gave to me: "
+            "ten Lords-a-Leaping, "
+            "nine Ladies Dancing, "
+            "eight Maids-a-Milking, "
+            "seven Swans-a-Swimming, "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(10, 10), expected)
+
+    def test_eleventh_day_eleven_pipers_piping(self):
+        expected = [
+            "On the eleventh day of Christmas my true love gave to me: "
+            "eleven Pipers Piping, "
+            "ten Lords-a-Leaping, "
+            "nine Ladies Dancing, "
+            "eight Maids-a-Milking, "
+            "seven Swans-a-Swimming, "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(11, 11), expected)
+
+    def test_twelfth_day_twelve_drummers_drumming(self):
+        expected = [
+            "On the twelfth day of Christmas my true love gave to me: "
+            "twelve Drummers Drumming, "
+            "eleven Pipers Piping, "
+            "ten Lords-a-Leaping, "
+            "nine Ladies Dancing, "
+            "eight Maids-a-Milking, "
+            "seven Swans-a-Swimming, "
+            "six Geese-a-Laying, "
+            "five Gold Rings, "
+            "four Calling Birds, "
+            "three French Hens, "
+            "two Turtle Doves, "
+            "and a Partridge in a Pear Tree."
+        ]
+        self.assertEqual(recite(12, 12), expected)
+
+    def test_recites_first_three_verses_of_the_song(self):
+        expected = [recite(n, n)[0] for n in range(1, 4)]
+        self.assertEqual(recite(1, 3), expected)
+
+    def test_recites_three_verses_from_the_middle_of_the_song(self):
+        expected = [recite(n, n)[0] for n in range(4, 7)]
+        self.assertEqual(recite(4, 6), expected)
+
+    def test_recites_the_whole_song(self):
+        expected = [recite(n, n)[0] for n in range(1, 13)]
+        self.assertEqual(recite(1, 12), expected)
+
+
+if __name__ == "__main__":
+    unittest.main()