def test_next_to_houses(self):
"""
Some rules tell you that next to a house a certain condition is true.
The white house is to the left of the green house.
House 2 is to the right of house 1.
1, 2, 3, 4, 5
"""
self.assertIsNone(einstein.left_of('1'))
self.assertIsNone(einstein.right_of('5'))
self.assertIsNone(einstein.left_of('20'))
self.assertEqual('1', einstein.left_of('2'))
self.assertEqual('3', einstein.left_of('4'))
self.assertEqual('3', einstein.right_of('2'))
self.assertEqual(['2', '4'], einstein.next_to('3'))
self.assertEqual(['2'], einstein.next_to('1'))
self.assertEqual(['4'], einstein.next_to('5'))
def test_next_to_houses(self):
"""
Some rules tell you that next to a house a certain condition is true.
The white house is to the left of the green house.
House 2 is to the right of house 1.
1, 2, 3, 4, 5
"""
self.assertIsNone(einstein.left_of('1'))
self.assertIsNone(einstein.right_of('5'))
self.assertIsNone(einstein.left_of('20'))
self.assertEqual('1', einstein.left_of('2'))
self.assertEqual('3', einstein.left_of('4'))
self.assertEqual('3', einstein.right_of('2'))
self.assertEqual(['2', '4'], einstein.next_to('3'))
self.assertEqual(['2'], einstein.next_to('1'))
self.assertEqual(['4'], einstein.next_to('5'))
def rule4(state):
"""The green house is on the left of the white house."""
green_house = einstein.get_position('green', state)
white_house = einstein.get_position('white', state)
# Green and white are already defined
if green_house and white_house:
return state
# Green is defined so we can define white
elif green_house:
return einstein.assign_value(einstein.right_of(house), 'house_color',
'white', state)
# White is defined so we can define green
elif white_house:
return einstein.assign_value(einstein.right_of(house), 'house_color',
'white', state)
# Neither Green or White are defined
else:
# Go through all houses and make the following assertions
for house in state.keys():
house_to_right = einstein.right_of(house)
house_to_left = einstein.left_of(house)
# Nothing on the left so this cannot be the white house
if not house_to_left:
state = einstein.remove_value(house, 'house_color', 'white',
state)
# nothing o the right so this cannot be the green house
elif not house_to_right:
state = einstein.remove_value(house, 'house_color', 'green',
state)
if house_to_right:
has_green = 'green' in state[house]['house_color']
white_to_right = 'white' in state[house_to_right][
'house_color']
# If this house_color is green
# BUT the house on the right is not white
# THEN green must be removed from this house
if has_green and not white_to_right:
state = einstein.remove_value(house, 'house_color',
'green', state)
# If this house is NOT green
# THEN the house to the right cannot be white
elif not has_green and white_to_right:
state = einstein.remove_value(house_to_right,
'house_color', 'white',
state)
return state
def rule4(state):
"""The green house is on the left of the white house."""
green_house = einstein.get_position('green', state)
white_house = einstein.get_position('white', state)
# Green and white are already defined
if green_house and white_house:
return state
# Green is defined so we can define white
elif green_house:
return einstein.assign_value(einstein.right_of(house), 'house_color', 'white', state)
# White is defined so we can define green
elif white_house:
return einstein.assign_value(einstein.right_of(house), 'house_color', 'white', state)
# Neither Green or White are defined
else:
# Go through all houses and make the following assertions
for house in state.keys():
house_to_right = einstein.right_of(house)
house_to_left = einstein.left_of(house)
# Nothing on the left so this cannot be the white house
if not house_to_left:
state = einstein.remove_value(house, 'house_color', 'white', state)
# nothing o the right so this cannot be the green house
elif not house_to_right:
state = einstein.remove_value(house, 'house_color', 'green', state)
if house_to_right:
has_green = 'green' in state[house]['house_color']
white_to_right = 'white' in state[house_to_right]['house_color']
# If this house_color is green
# BUT the house on the right is not white
# THEN green must be removed from this house
if has_green and not white_to_right:
state = einstein.remove_value(house, 'house_color', 'green', state)
# If this house is NOT green
# THEN the house to the right cannot be white
elif not has_green and white_to_right:
state = einstein.remove_value(house_to_right, 'house_color', 'white', state)
return state