code: def main():
      
      with open(FILENAME, "r") as file_obj:
          contents = file_obj.read()
      desired = get_desired()
      if contents == EXPECTED:
          with open(FILENAME, "w") as file_obj:
              file_obj.write(desired)
      elif contents != desired:
          raise ValueError("Unexpected contents", contents, "Expected", EXPECTED)
docs: Main entry point to replace autogenerated contents.
  
      Raises:
          ValueError: If the file doesn't contain the expected or
              desired contents.