diff -r d8b66e3fd335 -r 3a84a79c4ed5 cubicweb/etwist/service.py
--- a/cubicweb/etwist/service.py	Thu Nov 24 16:58:27 2016 +0100
+++ b/cubicweb/etwist/service.py	Thu Nov 24 16:58:50 2016 +0100
@@ -1,4 +1,4 @@
-# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# copyright 2003-2016 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This file is part of CubicWeb.
@@ -38,15 +38,17 @@
 from cubicweb import set_log_methods
 from cubicweb.cwconfig import CubicWebConfiguration as cwcfg
 
+
 def _check_env(env):
     env_vars = ('CW_INSTANCES_DIR', 'CW_INSTANCES_DATA_DIR', 'CW_RUNTIME_DIR')
     for var in env_vars:
         if var not in env:
-            raise Exception('The environment variables %s must be set.' % \
+            raise Exception('The environment variables %s must be set.' %
                             ', '.join(env_vars))
     if not env.get('USERNAME'):
         env['USERNAME'] = 'cubicweb'
 
+
 class CWService(object, win32serviceutil.ServiceFramework):
     _svc_name_ = None
     _svc_display_name_ = None