builder.py

#!/usr/bin/python
# -*- coding : utf-8 -*-

"""
@author: Diogenes Augusto Fernandes Herminio <diofeher@gmail.com>
https://gist.github.com/420905#file_builder_python.py
"""


# 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: {0.floor} | Size: {0.size}'.format(self)


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

### OUTPUT ###
# Floor: One | Size: Big
# Floor: More than One | Size: Small