self.list.InsertStringItem(i, subnet.address + '/' + subnet.prefixlen)
else:
self.list.SetStringItem(i, 0, subnet.address + '/' + subnet.prefixlen)
self.list.InsertStringItem(i, subnet.address + '/' + subnet.prefixlen)
else:
self.list.SetStringItem(i, 0, subnet.address + '/' + subnet.prefixlen)