def _is_all_instance(self, instance_of, *args):
        for a in args:
            if not isinstance(a, instance_of):
                return False
        return True
Check if isinstance(args[0], instance_of) returns True for *all*
dataset/ETHPy150Open daltonmatos/wsgid/wsgid/loaders/djangoloader.py/DjangoAppLoader._is_all_instance