Fix import of traceback module

celery/datastructures.py

@@ -9,6 +9,7 @@ import itertools
 import threading
 import time
 import os
+import traceback
 from UserList import UserList
 from celery.timer import TimeoutTimer, TimeoutError
 from celery.conf import REAP_TIMEOUT, SEND_CELERY_TASK_ERROR_EMAILS

celery/worker.py

@@ -18,7 +18,6 @@ import traceback
 import logging
 import time
 import sys
-import traceback
 
 
 class EmptyQueue(Exception):