new_contents: #! /usr/bin/python
  # -*- coding: utf-8 -*-
  '''
  Builder Pattern
  Author: reimen
  Data: Oct.9.2014
  '''
  from abc import *
  
  class Builder(object):
      __metaclass__ = ABCMeta
      @abstractmethod
      def build(self): pass
  
  class Product(object):
      def execute(self):
          print "Hi"
  
  class ConcreteBuilder(Builder):
      def build(self):
          return Product()
  
  class Director(object):
      def __init__(self):
          self.builder = ConcreteBuilder()
  
      def create(self):
          return self.builder.build()
  
  if __name__ == '__main__':
      a = Director()
      p = a.create()
      p.execute()
  
subject: Add Builder.py