I have two questions:
This is my code, which is not succe
As per the latest documentation, the correct method to call would be:
Reporter.objects.all().delete()
If you want to remove all the data from all your tables, you might want to try the command python manage.py flush. This will delete all of the data in your tables, but the tables themselves will still exist.
See more here: https://docs.djangoproject.com/en/1.8/ref/django-admin/