Handle KeyboardInterrupt consistently in python scripts

git_rename_branch.py

Index: git_rename_branch.py
diff --git a/git_rename_branch.py b/git_rename_branch.py
index cefa012ff614e5cf2626ea9f4b9a0f9ed381e6fd..c0ac42ec11cd50c8329061789e954c329909e169 100755
--- a/git_rename_branch.py
+++ b/git_rename_branch.py
@@ -44,7 +44,12 @@ def main(args):
   except subprocess2.CalledProcessError as cpe:
     sys.stderr.write(cpe.stderr)
     return 1
+  return 0
 
 
 if __name__ == '__main__':  # pragma: no cover
-  sys.exit(main(sys.argv[1:]))
+  try:
+    sys.exit(main(sys.argv[1:]))
+  except KeyboardInterrupt:
+    sys.stderr.write('interrupted\n')
+    sys.exit(1)