Section name
        :param sec_name:
        :return:

async def section_name(self, sec_name=None):
        """
        Section name
        :param sec_name:
        :return:
        """
        if self.writing:
            fvalue = sec_name.encode('ascii')
            await x.dump_uint(self.iobj, len(fvalue), 1)
            await self.iobj.awrite(bytearray(fvalue))

        else:
            ivalue = await x.load_uint(self.iobj, 1)
            fvalue = bytearray(ivalue)
            await self.iobj.areadinto(fvalue)
            return bytes(fvalue).decode('ascii')