Python Design Patterns - Hedonic Pattern Principles and Usage Examples

#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'Andy'
"""
big talk about design patterns
design pattern——hedonic model
hedonic model(Flyweight Pattern):Efficiently support large numbers of fine-grained objects using shared technologies
Instances of a class,Created only on first use,Other times the same instance is used,Reduced memory overhead
"""
# Abstract website class
class Website(object):
  def use(self):
    pass
# Site-specific categories
class ConcreteWebsite(Website):
  def __init__(self, name):
     = name
  def use(self):
    print "Web site categorization",
# Unshared site category
class UnshareConcreteWebsite(Website):
  def __init__(self, name):
     = name
  def use(self):
    print "Do not share website categorization",
# Website Factory
class WebsiteFactory(object):
  def __init__(self):
     = dict()
  # Get the website class If it exists, return it directly, if it does not exist, return it after you build it.
  def get_website(self, key):
    if not key in :
      [key] = ConcreteWebsite(key)
    return [key]
  # of website instances
  def get_website_count(self):
    return len(())
if __name__ == "__main__":
  factory = WebsiteFactory()
  f1 = factory.get_website("blog")
  f2 = factory.get_website("blog")
  f3 = factory.get_website("blog")
  f4 = factory.get_website("website")
  f5 = factory.get_website("website")
  f6 = factory.get_website("website")
  f7 = UnshareConcreteWebsite("test")
  ()
  ()
  ()
  ()
  ()
  ()
  ()