--- a/mercurial/patch.py	Mon Jun 26 17:20:46 2017 +0530
+++ b/mercurial/patch.py	Sun Jun 25 03:11:55 2017 +0530
@@ -2735,10 +2735,10 @@
         if line and line[-1] in '+-':
             name, graph = line.rsplit(' ', 1)
             yield (name + ' ', '')
-            m = re.search(r'\++', graph)
+            m = re.search(br'\++', graph)
             if m:
                 yield (m.group(0), 'diffstat.inserted')
-            m = re.search(r'-+', graph)
+            m = re.search(br'-+', graph)
             if m:
                 yield (m.group(0), 'diffstat.deleted')
         else: