code: def start(self, use_atexit=True):
          '''Start the executable.
  
          Args:
              use_atexit (bool): If True, the process will automatically be
                  terminated at exit.
          '''
          assert not self._process
  
          _logger.debug('Starting process %s', self._proc_args)
  
          process_future = asyncio.create_subprocess_exec(
              stdin=subprocess.PIPE,
              stdout=subprocess.PIPE,
              stderr=subprocess.PIPE,
              *self._proc_args
          )
          self._process = yield from process_future
  
          self._stderr_reader = asyncio.async(self._read_stderr())
          self._stdout_reader = asyncio.async(self._read_stdout())
  
          if use_atexit:
              atexit.register(self.closef start(self, use_atexit=True):
          '''Start the executable.
  
          Args:
              use_atexit (bool): If True, the process will automatically be
                  terminated at exit.
          '''
          assert not self._process
  
          _logger.debug('Starting process %s', self._proc_args)
  
          process_future = asyncio.create_subprocess_exec(
              stdin=subprocess.PIPE,
              stdout=subprocess.PIPE,
              stderr=subprocess.PIPE,
              *self._proc_args
          )
          self._process = yield from process_future
  
          self._stderr_reader = asyncio.async(self._read_stderr())
          self._stdout_reader = asyncio.async(self._read_stdout())
  
          if use_atexit:
              atexit.register(self.close)
docs: Start the executable.
  
          Args:
              use_atexit (bool): If True, the process will automatically be
                  terminated at exit.