code: def get_models(app_labels):
      
  
      # These models are not to be output, e.g. because they can be generated automatically
      # TODO: This should be "appname.modelname" string
      EXCLUDED_MODELS = (ContentType, )
  
      models = []
  
      # If no app labels are given, return all
      if not app_labels:
          for app in apps.get_app_configs():
              models += [m for m in apps.get_app_config(app.label).get_models()
                         if m not in EXCLUDED_MODELS]
          return models
  
      # Get all relevant apps
      for app_label in app_labels:
          # If a specific model is mentioned, get only that model
          if "." in app_label:
              app_label, model_name = app_label.split(".", 1)
              models.append(apps.get_model(app_label, model_name))
          # Get all models for a given app
          else:
              models += [m for m in apps.get_app_config(app_label).get_models()
                         if m not in EXCLUDED_MODELS]
  
      return models
docs: Get a list of models for the given app labels, with some exceptions.
      TODO: If a required model is referenced, it should also be included.
      Or at least discovered with a get_or_create() call.