from functools import reduce

celery/__compat__.py

@@ -14,6 +14,7 @@ from __future__ import absolute_import
 import operator
 import sys
 
+from functools import reduce
 from importlib import import_module
 from types import ModuleType
 

celery/app/base.py

@@ -13,7 +13,7 @@ import warnings
 from collections import deque
 from contextlib import contextmanager
 from copy import deepcopy
-from functools import wraps
+from functools import reduce, wraps
 from threading import Lock
 
 from billiard.util import register_after_fork

celery/utils/term.py

@@ -10,6 +10,8 @@ from __future__ import absolute_import
 
 import platform
 
+from functools import reduce
+
 from .encoding import safe_str
 
 BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)