Imported reduce from functools for forward compatibility.

In Python 3, reduce has to be imported from functools.

1 files changed, 1 insertions, 0 deletions

diff --git a/django/core/exceptions.py b/django/core/exceptions.py
index 201a854a4b..e3d1dc9c7e 100644
--- a/django/core/exceptions.py
+++ b/django/core/exceptions.py
@@ -1,6 +1,7 @@
 """
 Global Django exception and warning classes.
 """
+from functools import reduce
 
 class DjangoRuntimeWarning(RuntimeWarning):
     pass