requirements/lint.txt: ruff>=0.7.0

src/drf_yasg/openapi.py

@@ -517,7 +517,7 @@ def __init__(self, resolver, name, scope, expected_type, ignore_unresolved=False
         :param bool ignore_unresolved: do not throw if the referenced object does not exist
         """
         super(_Ref, self).__init__()
-        assert not isinstance(self, _Ref), "do not instantiate _Ref directly"
+        assert type(self) != _Ref, "do not instantiate _Ref directly"  # noqa: E721
         ref_name = "#/{scope}/{name}".format(scope=scope, name=name)
         if not ignore_unresolved:
             obj = resolver.get(name, scope)