Builder design pattern example

builder.py

class Director():
    '''Controls creation of final product '''
    def __init__(self, builder):
        self._builder = builder
        
    def create_house(self):
        self._builder.create_new_house()
        self._builder.add_basement()
        self._builder.add_rooms()
        self._builder.add_roof()
    
    def get_house(self):
        return self._builder.house

class Builder():
    ''' Abstract Builder'''
    def __init__(self):
        self.house = None
        
    def create_new_house(self):
        self.house = House()     

class BarracaBuilder(Builder):
    '''Concrete Builder that provide parts for building baraca '''
    
    def add_basement(self):
        self.house.basement = 'Cement basement'
        
    def add_roof(self):
        self.house.roof = 'Wood shingl roof'
    
    def add_rooms(self):
        self.house.rooms = 1

class House():
    ''' Product '''
    def __init__(self):
        self.basement = None
        self.roof = None
        self.rooms = None
        
    def __str__(self):
        return 'Building {}, {}, and {} room'.format(self.basement,
                self.roof, self.rooms)

builder = BarracaBuilder()
director = Director(builder)
director.create_house()
house = director.get_house()
print(house)

#OUTPUT
#Building Cement basement, Wood shingl roof, and 1 room