django argument of type 'LazySettings' is not iterable; how then to check if a setting exists?

from django.conf import settings

def my_view(self, request, *args, **kwargs):
    if 'LOCAL' in settings and settings.LOCAL:
        # do something

TypeError at ... argument of type 'LazySettings' is not iterable

How then to check if a setting exists? Otherwise I get an attribute error.