diff --git a/manifest_xml.py b/manifest_xml.py
index e32551c8..84e3d9f9 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -533,7 +533,6 @@ https://gerrit.googlesource.com/git-repo/+/HEAD/docs/manifest-format.md
 
   def _output_manifest_project_extras(self, p, e):
     """Manifests can modify e if they support extra project attributes."""
-    pass
 
   @property
   def paths(self):
diff --git a/subcmds/forall.py b/subcmds/forall.py
index c5864336..ef11851b 100644
--- a/subcmds/forall.py
+++ b/subcmds/forall.py
@@ -280,7 +280,6 @@ without iterating through the remaining projects.
 
 class WorkerKeyboardInterrupt(Exception):
   """ Keyboard interrupt exception for worker processes. """
-  pass
 
 
 def InitWorker():
diff --git a/subcmds/sync.py b/subcmds/sync.py
index 818f7c8a..5b1024df 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -68,7 +68,6 @@ _ONE_DAY_S = 24 * 60 * 60
 
 class _FetchError(Exception):
   """Internal error thrown in _FetchHelper() when we don't want stack trace."""
-  pass
 
 
 class _CheckoutError(Exception):