- pull out type() ahead of time to cut down on fn calls.

Would replace this with set(dir(self)) but not sure if some
class schemes may have issues with dir() (also for low numbers
of args, not using the set() probably faster).

lib/sqlalchemy/ext/declarative.py

@@ -1162,11 +1162,12 @@ def _declarative_constructor(self, **kwargs):
     attributes of the instance's class are allowed. These could be,
     for example, any mapped columns or relationships.
     """
+    cls_ = type(self)
     for k in kwargs:
-        if not hasattr(type(self), k):
+        if not hasattr(cls_, k):
             raise TypeError(
                 "%r is an invalid keyword argument for %s" %
-                (k, type(self).__name__))
+                (k, cls_.__name__))
         setattr(self, k, kwargs[k])
 _declarative_constructor.__name__ = '__init__'