#!/usr/bin/env python
#
# Create a pin list to crack a supra key box.
#
# Supra key boxes (I am told) have the unique feature of not requiring
# the owner to remember the order in which a pin is entered (!).
# Additionally numbers in the pin can only be used once (e.g. 2234 is
# invalid because 2 appears twice).
#

if __name__ == '__main__':

   pin_length = 5      # <-- Adjust pin-length here

   i = -1
   end_pin = int('9'*pin_length)
   pin_list = []

   while i < end_pin:
       i += 1

       # generate pin with leading 0's; convert it to a list; sort it
       pin = str(i).zfill(pin_length)
       pin = list(pin)
       pin.sort()

       # skip pins with reoccurring chars; pins already in our list
       if [c for c in pin if pin.count(c) > 1]:
           continue
       if pin in pin_list:
           continue

       # add our pin to the master list of valid pins
       pin_list.append(pin)

   # print results
   for pin in pin_list:
       print(''.join(pin))

   print('There are {pincount} combinations.'.format(
           pincount=len(pin_list)))