text: import argparse
  parser = argparse.ArgumentParser()
  
  parser.add_argument('files', metavar='F', type=str, nargs='+')
  parser.add_argument('-n', '--numbers', action='store_true',
          help='Print line numbers')
  
  args = parser.parse_args()
  
  print(">>> parsed args: ", args)
  
  line_number = 1
  for in_file_name in args.files:
      in_file = open(in_file_name)
      if args.numbers:
          for line in in_file.readlines():
              print(f"\t{line_number}\t{line}", end="")
              line_number += 1
      else:
          print(in_file.read())
  