added deprecation warning for mako tuple

1 files changed, 9 insertions, 0 deletions

diff --git a/pyramid/mako_templating.py b/pyramid/mako_templating.py
index fa45b671c..c07ee227f 100644
--- a/pyramid/mako_templating.py
+++ b/pyramid/mako_templating.py
@@ -2,6 +2,7 @@ import os
 import posixpath
 import sys
 import threading
+import warnings
 
 from zope.interface import (
     implementer,
@@ -217,6 +218,14 @@ class MakoLookupTemplateRenderer(object):
             system['_context'] = context
         # tuple returned to be deprecated
         if isinstance(value, tuple):
+            warnings.warn(
+                'Using a tuple in the form (\'defname\', {}) to render a '
+                'Mako partial will be deprecated in the future. Use a '
+                'Mako template renderer as documented in the "Using A '
+                'Mako def name Within a Renderer Name" chapter of the '
+                'Pyramid narrative documentation instead',
+                DeprecationWarning,
+                3)
             self.defname, value = value
         try:
             system.update(value)