message: Python3 for infra/config presubmit
  Cr-Commit-Position: refs/heads/main@{#38578}
diff: # in the file PATENTS. All contributing project authors may
  # be found in the AUTHORS file in the root of the source tree.
  +USE_PYTHON3 = True
  +
  def CheckChangeOnUpload(input_api, output_api):
  return input_api.RunTests(
  