class Generator(MasterClass): def generate_pid(self): from .models import PidCounter, PID today = date.today() datestr = "{0.day:02}{0.month:02}{1}".format(today, str(today.year)[-1]) counter, _ = PidCounter.objects.get_or_create(date=today) counter.counter += 1 counter.save() num = "{0:04}".format(counter.counter) nnc = 'PREFIX{0}{1}{2}{3}'.format("%04d" % int(self.account.id), datestr, num, self.sender.id) checksum1 = nnc[-2] checksum2 = 0 + (1 + 2 + int(nnc[4]) + int(nnc[6]) + int(nnc[8]) + int(nnc[10]) + int(nnc[12]) + int(nnc[14])+ int(nnc[16]) + int(nnc[18]) + int(nnc[20])) * 4 checksum3 = 0 + int(nnc[3]) + int(nnc[5]) + int(nnc[7]) + int(nnc[9]) + int(nnc[11]) + int(nnc[13]) + int(nnc[15]) + int(nnc[17]) + int(nnc[19] + int(nnc[21])) * 7 checksum4 = checksum2 + checksum3 checksum = 0 while (checksum4 + checksum) % 10: checksum += 1 nc = "{0}{1}".format(nnc, checksum) try: PID.objects.get(pid=nc) nc = self.generate_pid() except PID.DoesNotExist: return nc