code: def attach_cdrom(self, datacenter_id, server_id, cdrom_id):
          
          data = '{ "id": "' + cdrom_id + '" }'
  
          response = self._perform_request(
              url='/datacenters/%s/servers/%s/cdroms' % (
                  datacenter_id,
                  server_id),
              method='POST',
              data=data)
  
          return response
docs: Attaches a CDROM to a server.
  
          :param      datacenter_id: The unique ID of the data center.
          :type       datacenter_id: ``str``
  
          :param      server_id: The unique ID of the server.
          :type       server_id: ``str``
  
          :param      cdrom_id: The unique ID of the CDROM.
          :type       cdrom_id: ``str``