diff --git a/lib/importer.py b/lib/importer.py
index 0b612f1..beb5fa5 100644
--- a/lib/importer.py
+++ b/lib/importer.py
@@ -12,9 +12,9 @@ from lib.history import History
 from lib.obs import OBS
 from lib.obs_revision import OBSRevision
 from lib.proxy_sha256 import ProxySHA256, md5, sha256
-import xml.etree.ElementTree as ET
-from lib.user import User
 from lib.tree_builder import TreeBuilder
+from lib.user import User
+
 
 def _files_hash(hash_alg, dirpath):
     """List of (filepath, md5) for a directory"""
diff --git a/lib/user.py b/lib/user.py
index 68fe415..705e557 100644
--- a/lib/user.py
+++ b/lib/user.py
@@ -1,4 +1,4 @@
-FAKE_ACCOUNTS = ('unknown', 'buildservice-autocommit', 'autobuild', '_service')
+FAKE_ACCOUNTS = ("unknown", "buildservice-autocommit", "autobuild", "_service")
 
 
 class User:
@@ -44,7 +44,9 @@ class User:
             cur.execute(
                 """SELECT DISTINCT revisions.userid 
                     FROM revisions LEFT JOIN users ON revisions.userid = users.userid 
-                    WHERE users.userid IS NULL AND revisions.userid NOT IN {}""".format(FAKE_ACCOUNTS)
+                    WHERE users.userid IS NULL AND revisions.userid NOT IN {}""".format(
+                    FAKE_ACCOUNTS
+                )
             )
             missing_users = [row[0] for row in cur.fetchall()]
         return missing_users