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