code: def send(self, payload, opcode=ABNF.OPCODE_TEXT):
          
  
          frame = ABNF.create_frame(payload, opcode)
          return self.send_frame(frame)
docs: Send the data as string.
  
          payload: Payload must be utf-8 string or unicode,
                    if the opcode is OPCODE_TEXT.
                    Otherwise, it must be string(byte array)
  
          opcode: operation code to send. Please see OPCODE_XXX.