Reduced reduce() usage; refs #23796.

django.core.exceptions.ValidationError.messages() and
django.db.backends.schema.BaseDatabaseSchemaEditor._alter_field():
Replaced reduce(operator.add, ...) w/uncoupled, explicit sum()

1 files changed, 1 insertions, 4 deletions

diff --git a/django/core/exceptions.py b/django/core/exceptions.py
index 28e712e0a5..a8b432b1c6 100644
--- a/django/core/exceptions.py
+++ b/django/core/exceptions.py
@@ -1,9 +1,6 @@
 """
 Global Django exception and warning classes.
 """
-from functools import reduce
-import operator
-
 from django.utils import six
 from django.utils.encoding import force_text
 
@@ -137,7 +134,7 @@ class ValidationError(Exception):
     @property
     def messages(self):
         if hasattr(self, 'error_dict'):
-            return reduce(operator.add, dict(self).values())
+            return sum(dict(self).values(), [])
         return list(self)
 
     def update_error_dict(self, error_dict):