How to remove models from django?

There is no syntax. Django doesn't removes tables or columns. You have to manually change your database or use a migration tool like South.

If you justing playing around with tutorial the easier way is to delete your sqlite database file and run a sync again.

If you don't want to delete and re-sync your current database, the best way is to drop the table from your model manually:

$ python manage.py dbshell

> (Inside the DB shell)
> DROP TABLE {app-name}_{model-name};