https://github.com/ethereum/go-ethereum/wiki/Management-APIs#txpool_status

        :rtype: dict

def txpool_status(self):
        """https://github.com/ethereum/go-ethereum/wiki/Management-APIs#txpool_status

        :rtype: dict
        """
        result = yield from self.rpc_call('txpool_status')
        return {k: hex_to_dec(v) for k, v in result.items()}