builder.py

'''
Creatonal -> Builder
'''

class Director():
    def __init__(self,builder):
        self._builder = builder
        
    def construct_car(self):
        self._builder.create_new_car()
        self._builder.add_model()
        self._builder.add_tires()
        self._builder.add_engine()
        
    def get_car(self):
        return self._builder.car
    
    
class Builder():
    '''Abstract Builder'''
    def __init__(self):
        self.car = None
        
    def create_new_car(self):
        self.car = Car()
    
class SkyLarkBuilder(Builder):
    '''Concrate Builder'''
    def add_model(self):
        self.car.model = 'Skylark'
    def add_tires(self):
        self.car.tires = 'Regular tires'
    def add_engine(self):
        self.car.engine = 'Turbo engine'
        
class Car():
    '''Product'''
    def __init__(self):
        self.model = None
        self.tires = None
        self.engine = None
        
    def __str__(self):
        return '{}, {}, {}'.format(self.model,self.tires,self.engine)
    
    
builder = SkyLarkBuilder()
director = Director(builder)
director.construct_car()
car = director.get_car()
print(car)