get rid of the whole is_callable stuff, because now we can just check for hasattr(obj, 'py__call__')

jedi/api/__init__.py

@@ -585,7 +585,7 @@ class Script(object):
             except (IndexError, AttributeError):
                 pass
         return [classes.CallSignature(self._evaluator, o, call, index, key_name)
-                for o in origins if o.is_callable()]
+                for o in origins if hasattr(o, 'py__call__')]
 
     def _analysis(self):
         #statements = set(chain(*self._parser.module().used_names.values()))

jedi/api/classes.py

@@ -335,7 +335,7 @@ class BaseDefinition(object):
         Otherwise returns a list of `Definition` that represents the params.
         """
         followed = self._follow_statements_imports()
-        if not followed or not followed[0].is_callable():
+        if not followed or not hasattr(followed[0], 'py__call__'):
             raise AttributeError()
         followed = followed[0]  # only check the first one.