diff --git a/pykolab/cli/cmd_sync.py b/pykolab/cli/cmd_sync.py
--- a/pykolab/cli/cmd_sync.py
+++ b/pykolab/cli/cmd_sync.py
@@ -74,20 +74,20 @@
     auth = Auth()
 
     if conf.domain == "all":
-      log.debug(_("Listing domains..."), level=5)
-      start_time = time.time()
-      domains = auth.list_domains()
-      end_time = time.time()
-      log.debug(
+        log.debug(_("Listing domains..."), level=5)
+        start_time = time.time()
+        domains = auth.list_domains()
+        end_time = time.time()
+        log.debug(
             _("Found %d domains in %d seconds") % (
-                    len(domains),
-                    (end_time-start_time)
-                ),
+                len(domains),
+                (end_time-start_time)
+             ),
             level=8
         )
     else:
-      domains = {}
-      domains[conf.domain] = conf.domain
+        domains = {}
+        domains[conf.domain] = conf.domain
 
     if version.StrictVersion(sys.version[:3]) >= version.StrictVersion("2.7"):
         pool = multiprocessing.Pool(conf.threads, worker_process, (), 1)
@@ -125,14 +125,13 @@
     entry = utils.normalize(kw)
 
     mailbox_attribute = conf.get('cyrus-sasl', 'result_attribute')
-    if mailbox_attribute == None:
+    if mailbox_attribute is None:
         mailbox_attribute = 'mail'
 
-
     if mailbox_attribute not in entry:
         return
 
-    if not 'kolabinetorgperson' in entry['objectclass']:
+    if 'kolabinetorgperson' not in entry['objectclass']:
         return
 
     imap = IMAP()