from django.db import connection
tables = connection.introspection.table_names()
seen_models = connection.introspection.installed_models(tables)

在manage.py的syncdb命令中看到.

As seen in the syncdb command for manage.py.

在上面的答案问世多年之后，在下面的评论中， ThePhi 说(我没有测试过):

In a comment below, years after the answer above, ThePhi says (I haven't tested it):

from django.apps import apps 
from django.contrib import admin 
from django.contrib.admin.sites import AlreadyRegistered 

app_models = apps.get_app_config('my_app').get_models()