After calling django.setup(), you can load the app configurations and models from the registry as follows:

>>> from django.apps import apps as django_apps
>>> magazine_app_config = django_apps.get_app_config("magazine")
>>> magazine_app_config
<MagazineAppConfig: magazine>
>>> magazine_app_config.models_module
<module 'magazine.models' from '/usr/src/app/magazine/models.py'>
>>> NewsArticle = django_apps.get_model("magazine", "NewsArticle")
>>> NewsArticle
<class 'magazine.models.NewsArticle'>

You can read more about app configuration in the official Django documentation at
https://docs.djangoproject.com/en/2.1/ref/applications/.