unsafe class ATMega16
    {
        ..............
        public byte DDRA
        {
            set
            {
                usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT,
                                RQ_IO_WRITE, value, aDDRA, null, 0, 5000);
            }
            get
            {
                usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
                                RQ_IO_READ, 0, aDDRA, buffer, 1, 5000);

                return buffer[0];
            }
        }
        .............
    }

dev = ATMega16()
dev.DDRA |= 0x01

class ATMega16():
class DDRA:
    reqbuffer = [0]*4
    def __set__(self):
      self.handle.controlMsg( USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT,RQ_IO_WRITE, 0, value, aDDRA,100)

    def __get__(self):
      return self.handle.controlMsg(USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,CUSTOM_IO_READ,0,value,aDDRA,0,timeout)

class Foo(object):
   _x = None

   @property
   def x(self):
       return self._x

class Foo(object):

    _x = None

    def getX(self):
        return self._x

    def setX(self, value):
        self._x = value

    x = property(getX, setX)