如何在没有定义的情况下在django中操作模型？

from django.apps import apps
from django.contrib.contenttypes.models import ContentType

model = apps.get_model(app_label='your_app_label', model_name='your_model_name')
content_type = ContentType.objects.get_for_model(model)

object = model.objects.create(field1=value1, field2=value2, ...)

object.save()

object.field1 = new_value1
object.field2 = new_value2
...
object.save()

object.delete()