code: def main():
      
  
      if len(sys.argv) != 3:
          print('Usage: {} <file1> <file2>'.format(sys.argv[0]))
          exit(-1)
      file1 = sys.argv[1]
      file2 = sys.argv[2]
  
      with open(file1) as f1, open(file2) as f2:
          for line1, line2 in zip(f1, f2):
              print("Line 1: {}".format(line1.strip()))
              print("Line 2: {}".format(line2.strip()))
              dist, _, _ = edit_distance_backpointer(line1.split(), line2.split())
              print('Distance: {}'.format(dist))
              print('=' * 80)
docs: Read two files line-by-line and print edit distances between each pair
      of lines. Will terminate at the end of the shorter of the two files.