How to limit a view to superuser only?

is_superuser isn’t a permission, it’s an attribute on the user model. Django already has another decorator you can make use of called user_passes_test to perform this check:

from django.contrib.auth.decorators import user_passes_test

@user_passes_test(lambda u: u.is_superuser)
def score_reset(self,...):
    ...

• allowing only super user login
• Django is_staff permission decorator