code: def policy(self, args):
          
  
          word = args[0]
          if word == 'reject':
              self.accepted_ports = None
              self.rejected_ports = []
              target = self.rejected_ports
  
          elif word == 'accept':
              self.accepted_ports = []
              self.rejected_ports = None
              target = self.accepted_ports
  
          else:
              raise RuntimeError("Don't understand policy word \"%s\"" % word)
  
          for port in args[1].split(','):
              if '-' in port:
                  (a, b) = port.split('-')
                  target.append(PortRange(int(a), int(b)))
              else:
                  target.append(int(port))
docs: setter for the policy descriptor