code: def silent_parse_args(self, command, args):
          
          args_ns = argparse.Namespace()
          stderr_save = argparse._sys.stderr
          stdout_save = argparse._sys.stdout
          argparse._sys.stderr = os.devnull
          argparse._sys.stdout = os.devnull
          try:
              command.argparser.parse_known_args(args, args_ns)
          except BaseException:
              pass
          finally:
              argparse._sys.stderr = stderr_save
              argparse._sys.stdout = stdout_save
          return args_ns
docs: Silently attempt to parse args.  If there is a failure then we
          ignore the effects.  Using an in-place namespace object ensures we
          capture as many of the valid arguments as possible when the argparse
          system would otherwise throw away the results.