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python house

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{"track":"python","exercise":"house","id":"916880d9c36f42108a617d19739d07b2","url":"https://exercism.io/my/solutions/916880d9c36f42108a617d19739d07b2","handle":"Xevion","is_requester":true,"auto_approve":false}

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# House
Recite the nursery rhyme 'This is the House that Jack Built'.
> [The] process of placing a phrase of clause within another phrase of
> clause is called embedding. It is through the processes of recursion
> and embedding that we are able to take a finite number of forms (words
> and phrases) and construct an infinite number of expressions.
> Furthermore, embedding also allows us to construct an infinitely long
> structure, in theory anyway.
- [papyr.com](http://papyr.com/hypertextbooks/grammar/ph_noun.htm)
The nursery rhyme reads as follows:
```text
This is the house that Jack built.
This is the malt
that lay in the house that Jack built.
This is the rat
that ate the malt
that lay in the house that Jack built.
This is the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the farmer sowing his corn
that kept the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the horse and the hound and the horn
that belonged to the farmer sowing his corn
that kept the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
```
## 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 house_test.py`
- Python 3.4+: `pytest house_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 house_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/house` 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
British nursery rhyme [http://en.wikipedia.org/wiki/This_Is_The_House_That_Jack_Built](http://en.wikipedia.org/wiki/This_Is_The_House_That_Jack_Built)
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

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# Constants for building the rhyme
secondaries = ['sowing his corn', 'that crowed in the morn', 'all shaven and shorn', 'all tattered and torn', 'all forlorn', 'with the crumpled horn']
verbs = ['belonged to', 'kept', 'woke', 'married', 'kissed', 'milked', 'tossed', 'worried', 'killed', 'ate',]
nouns = ['farmer', 'rooster', 'priest', 'man', 'maiden', 'cow', 'dog', 'cat', 'rat', 'malt',]
intial = 'This is the house that Jack built.'
first = 'This is the horse and the hound and the horn'
last = 'that lay in the house that Jack built.'
# Build the array of verses
lines = (["that {} the {}{}".format(verbs[i], nouns[i], '' if i > 5 else ' ' + secondaries[i]) for i in range(10)])[::-1]
# Build a specific verse
def verse(n):
if n == 1: return [intial]
if n == 12: return [first] + [lines[-1]] + verse(11)[1:]
return ["This is the {}{}".format(
nouns[len(nouns) - n + 1],
'' if n < 6 else f' {secondaries[-n + 5 ]}')] + [lines[i - 3] for i in range(n, 2, -1)] + [last]
recite = lambda start, end : [' '.join(verse(x)) for x in range(start, end + 1)]

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# Rhyme found in http://www.pitt.edu/~dash/type2035.html
import unittest
from house import recite
# Tests adapted from `problem-specifications//canonical-data.json` @ v2.2.0
class HouseTest(unittest.TestCase):
def test_verse_one(self):
expected = ["This is the house that Jack built."]
self.assertEqual(recite(1, 1), expected)
def test_verse_two(self):
expected = [
"This is the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(2, 2), expected)
def test_verse_three(self):
expected = [
"This is the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(3, 3), expected)
def test_verse_four(self):
expected = [
"This is the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(4, 4), expected)
def test_verse_five(self):
expected = [
"This is the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(5, 5), expected)
def test_verse_six(self):
expected = [
"This is the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(6, 6), expected)
def test_verse_seven(self):
expected = [
"This is the maiden all forlorn "
"that milked the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(7, 7), expected)
def test_verse_eight(self):
expected = [
"This is the man all tattered and torn "
"that kissed the maiden all forlorn "
"that milked the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(8, 8), expected)
def test_verse_nine(self):
expected = [
"This is the priest all shaven and shorn "
"that married the man all tattered and torn "
"that kissed the maiden all forlorn "
"that milked the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(9, 9), expected)
def test_verse_10(self):
expected = [
"This is the rooster that crowed in the morn "
"that woke the priest all shaven and shorn "
"that married the man all tattered and torn "
"that kissed the maiden all forlorn "
"that milked the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(10, 10), expected)
def test_verse_11(self):
expected = [
"This is the farmer sowing his corn "
"that kept the rooster that crowed in the morn "
"that woke the priest all shaven and shorn "
"that married the man all tattered and torn "
"that kissed the maiden all forlorn "
"that milked the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(11, 11), expected)
def test_verse_12(self):
expected = [
"This is the horse and the hound and the horn "
"that belonged to the farmer sowing his corn "
"that kept the rooster that crowed in the morn "
"that woke the priest all shaven and shorn "
"that married the man all tattered and torn "
"that kissed the maiden all forlorn "
"that milked the cow with the crumpled horn "
"that tossed the dog "
"that worried the cat "
"that killed the rat "
"that ate the malt "
"that lay in the house that Jack built."
]
self.assertEqual(recite(12, 12), expected)
def test_multiple_verses(self):
expected = [recite(i, i)[0] for i in range(4, 9)]
self.assertEqual(recite(4, 8), expected)
def test_full_rhyme(self):
expected = [recite(i, i)[0] for i in range(1, 13)]
self.assertEqual(recite(1, 12), expected)
if __name__ == '__main__':
unittest.main()