1 files changed, 2 insertions, 2 deletions
diff --git a/yardstick/benchmark/runners/base.py b/yardstick/benchmark/runners/base.py
index 3ecf67736..13718d793 100755
--- a/yardstick/benchmark/runners/base.py
+++ b/yardstick/benchmark/runners/base.py
@@ -17,13 +17,14 @@
 # rally/rally/benchmark/runners/base.py
 
 from __future__ import absolute_import
-import importlib
+
 import logging
 import multiprocessing
 import subprocess
 import time
 import traceback
 
+import importlib
 
 from six.moves.queue import Empty
 
@@ -36,7 +37,6 @@ log = logging.getLogger(__name__)
 def _execute_shell_command(command):
     """execute shell script with error handling"""
     exitcode = 0
-    output = []
     try:
         output = subprocess.check_output(command, shell=True)
     except Exception: