THRIFT-583. python: Allow new-style classes for Interfaces

The original new-style class only affected structs, enums, and
exceptions.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@815874 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/compiler/cpp/src/generate/t_py_generator.cc b/compiler/cpp/src/generate/t_py_generator.cc
index 343c982..e79e954 100644
--- a/compiler/cpp/src/generate/t_py_generator.cc
+++ b/compiler/cpp/src/generate/t_py_generator.cc
@@ -922,6 +922,8 @@
   } else {
     if (gen_twisted_) {
       extends_if = "(Interface)";
+    } else if (gen_newstyle_) {
+      extends_if = "(object)";
     }
   }