code: def write(self, data):
          
          if isinstance(data, WriteBuffer):
              self._write_buffer.append(data)
          else:
              if len(data) > 0:
                  self._write_buffer.append(data)
          if self.aggressive_write:
              self._handle_write()
          if self._write_buffer._total_length > 0:
              self._register_or_update_event_handler(write=True)
docs: Buffers some data to be sent to the host:port in a non blocking way.
  
          So the data is always buffered and not sent on the socket in a
          synchronous way.
  
          You can give a WriteBuffer as parameter. The internal Connection
          WriteBuffer will be extended with this one (without copying).
  
          Args:
              data (str or WriteBuffer): string (or WriteBuffer) to write to
                  the host:port.