I use django, and have a lengthy models.py file.
class Foo(models.Model): name = models.CharField() class Bar(models.Model): name = models.CharField() class Fab(models.Model): name = models.CharField() Is there a way to make a list of all the classes in the file which are an instance of (models.Model)?
Django provides some utility methods to get model classes.
from django.db.models.loading import get_models, get_app app = get_app('myappname') models = get_models(app) When you say:
... classes in the file which are an instance of ...
i think you mean "...classes in the file which are subclass of...". If so:
classes = [cls for cls in dir(module) if issubbclass(getattr(module, cls), models.Model)] 
__dict__ and values and i did that stupid error.The inspect module might help you. Here's some code from a plugin manager class I wrote that might serve as an example.
def load_plugin_file(self, pathname): '''Return plugin classes in a plugin file.''' name, ext = os.path.splitext(os.path.basename(pathname)) f = file(pathname, 'r') module = imp.load_module(name, f, pathname, ('.py', 'r', imp.PY_SOURCE)) f.close() plugins = [] for dummy, member in inspect.getmembers(module, inspect.isclass): if issubclass(member, Plugin): p = member(*self.plugin_arguments, **self.plugin_keyword_arguments) if self.compatible_version(p.required_application_version): plugins.append(p) return plugins The other way to do it might be to use the builtin functions globals, issubclass, and isinstance.
In recent versions of Django the django.db.models.loading apparently no longer exists, but you can list the models of an app with :
from django.apps import apps app = apps.get_app_config("your_app_name") models = app.get_models() for model in models: print(model) 