How can i use yield from in Protocal?

[Bright Pan]

i want to run an coroutine in protocal,  but is failue : RuntimeError: Event loop is running.

how do it?

 for example:

class EchoServerProtocol(EchoProtocol):
    '''The :class:`EchoProtocol` used by the echo :func:`server`.
    '''
    @asyncio.coroutine
    def do_find_one(self):

        return '23567898'
    

    def response(self, data, rest):
        self.transport.write(data)
        data = data[:-len(self.separator)]
        self.connection.logger.info(data)
        phone = self._loop.run_until_complete(self.do_fine_one())
        self.connection.logger.info(phone)
        # If we get a QUIT message, close the transport.
        # Used by the test suite.
        if data == b'QUIT':
            self.transport.close()
        return data