Handle KeyboardInterrupt consistently in python scripts

git_new_branch.py

Index: git_new_branch.py
diff --git a/git_new_branch.py b/git_new_branch.py
index 18ce0180b7b24d123ecf78fef817c3eff54997e8..03b0fcc484bb1d3f6f693e734436ff3ee82e6ee9 100755
--- a/git_new_branch.py
+++ b/git_new_branch.py
@@ -48,7 +48,12 @@ def main(args):
     sys.stderr.write(cpe.stderr)
     return 1
   sys.stderr.write('Switched to branch %s.\n' % opts.branch_name)
+  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)