Builder Pattern implemented in Python

builder_python.py

#!/usr/bin/python
# -*- coding : utf-8 -*-
"""
    @author: Diogenes Augusto Fernandes Herminio <diofeher@gmail.com>
"""

# Director
class Director(object):
    def __init__(self):
        self.builder = None
        
    def construct_building(self):
        self.builder.new_building()
        self.builder.build_floor()
        self.builder.build_size()
    
    def get_building(self):
        return self.builder.building
    

# Abstract Builder
class Builder(object):
    def __init__(self):
        self.building = None
        
    def new_building(self):
        self.building = Building()
              
# Concrete Builder
class BuilderHouse(Builder):        
    def build_floor(self):
        self.building.floor ='One'
        
    def build_size(self):
        self.building.size = 'Big'
        
class BuilderFlat(Builder):
    def build_floor(self):
        self.building.floor ='More than One'
        
    def build_size(self):
        self.building.size = 'Small'
       
        
# Product
class Building(object):
    def __init__(self):
        self.floor = None
        self.size = None
        
    def __repr__(self):
        return 'Floor: %s | Size: %s' % (self.floor, self.size)


#Client
if __name__=="__main__":
    director = Director()
    director.builder = BuilderHouse()
    director.construct_building()
    building = director.get_building()
    print building