django单例模式

class AdminSite(object):     def __init__(self, name='admin'):         self._registry = {}      def register(self, model,**options):          self._registry[model] = model()  site=AdminSite()

from sites import site   class Dog(object):     pass  site.register(Dog)  print(site._registry)

from sites import site   class Pig(object):     pass  site.register(Pig)  print(site._registry)

if __name__ == '__main__':        from app01 import admin as admin01     from app02 import admin as admin02