twelve days and word count exercises

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

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+{"track":"python","exercise":"twelve-days","id":"1b45c94291dd447d9544ca5670288981","url":"https://exercism.io/my/solutions/1b45c94291dd447d9544ca5670288981","handle":"Xevion","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 the appropriate command below ([why they are different](https://github.com/pytest-dev/pytest/issues/1629#issue-161422224)):
+
+- Python 2.7: `py.test twelve_days_test.py`
+- Python 3.4+: `pytest twelve_days_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 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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+nouns =['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,', 'a Partridge in a Pear Tree.']
+positions = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth', 'seventh', 'eighth', 'ninth', 'tenth', 'eleventh', 'twelfth']
+expression = [['On the {} day of Christmas my true love gave to me:'.format(position)] for position in positions]
+for i in range(len(expression)):
+    build = nouns[12-i-1:]
+    if i != 0: build[-1] = 'and ' + build[-1] # [and] a Partridge in a Pear Tree
+    expression[i] = ' '.join(expression[i] + build)
+
+def recite(start=1, end=12):
+    if start > end or start < 1 or end > 12:
+        raise ValueError(f'Incorrect Parameters, sentence selection {start} to {end} is invalid.')
+    return expression[start-1:end]

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` @ v1.2.0
+
+class TwelveDaysTest(unittest.TestCase):
+    def test_verse1(self):
+        expected = ["On the first day of Christmas my true love gave to me: "
+                    "a Partridge in a Pear Tree."]
+        self.assertEqual(recite(1, 1), expected)
+
+    def test_verse2(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_verse3(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_verse4(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_verse5(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_verse6(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_verse7(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_verse8(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_verse9(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_verse10(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_verse11(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_verse12(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_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_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_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()