A short script to generate permutations based on a rance of numbers.

numGenerator.py

#!/usr/bin/python2.7

import sys, getopt, itertools

def help():
  print('test.py -r <range> -l <length> -o <outputfile> -c <count>')

def main(argv):

  genRange = None
  genLen = None
  genCount = -1
  outputfile = None

  try:
    opts, args = getopt.getopt(argv,'hr:l:o:c:',['range=','length=', 'output=', 'count='])

  except getopt.GetoptError:
    help()
    sys.exit(2)

  for opt, arg in opts:
    if opt == '-h':
      help()
      sys.exit()
    elif opt in ("-r", "--range"):
      genRange = int(arg)
    elif opt in ("-l", "--length"):
      genLen = int(arg)
    elif opt in ("-o", "--output"):
      outputfile = arg
    elif opt in ("-c", "--count"):
      genCount = int(arg)

  try:

    if not isinstance(genRange,int):
      raise ValueError
    if not isinstance(genLen,int):
      raise ValueError
    if not isinstance(genCount,int):
      raise ValueError
    if not isinstance(outputfile,str):
      raise ValueError

    loops = 0
    with open(outputfile,'w') as f:
      for x in itertools.permutations( range(genRange), genLen ):
        if genCount < 0 or loops < genCount:
          f.write('{}\r\n'.format(x))
          loops += 1
        else:
          break

  except ValueError:
    help()


if __name__ == "__main__":
    main(sys.argv[1:])