code: def start(self, *args, **kwargs):
          
          queue = Queue()
          stdout_reader, stderr_reader = \
              self._create_readers(queue, *args, **kwargs)
  
          self.thread = threading.Thread(target=self._read,
                                         args=(stdout_reader,
                                               stderr_reader,
                                               queue))
          self.thread.daemon = True
          self.thread.start()
docs: Start to read the stream(s).