# 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