diff --git a/swh/lister/core/indexing_lister.py b/swh/lister/core/indexing_lister.py
--- a/swh/lister/core/indexing_lister.py
+++ b/swh/lister/core/indexing_lister.py
@@ -153,8 +153,6 @@
         t = self.db_session.query(func.min(self.MODEL.indexable)).first()
         if t:
             return t[0]
-        else:
-            return None
 
     def db_last_index(self):
         """Look in the db for the largest indexable value
@@ -165,8 +163,6 @@
         t = self.db_session.query(func.max(self.MODEL.indexable)).first()
         if t:
             return t[0]
-        else:
-            return None
 
     def disable_deleted_repo_tasks(self, start, end, keep_these):
         """Disable tasks for repos that no longer exist between start and end.
diff --git a/swh/lister/github/lister.py b/swh/lister/github/lister.py
--- a/swh/lister/github/lister.py
+++ b/swh/lister/github/lister.py
@@ -34,15 +34,12 @@
             reset_at = int(response.headers['X-RateLimit-Reset'])
             delay = min(reset_at - time.time(), 3600)
             return True, delay
-        else:
-            return False, 0
+        return False, 0
 
     def get_next_target_from_response(self, response):
         if 'next' in response.links:
             next_url = response.links['next']['url']
             return int(self.API_URL_INDEX_RE.match(next_url).group(1))
-        else:
-            return None
 
     def transport_response_simplified(self, response):
         repos = response.json()
diff --git a/swh/lister/phabricator/lister.py b/swh/lister/phabricator/lister.py
--- a/swh/lister/phabricator/lister.py
+++ b/swh/lister/phabricator/lister.py
@@ -99,8 +99,7 @@
         body = response.json()['result']['cursor']
         if body['after'] != 'null':
             return body['after']
-        else:
-            return None
+        return None
 
     def transport_response_simplified(self, response):
         repos = response.json()