new_contents: #/usr/bin/env python
  # Test pretty format: "{n-th arg: spaces}".format(var...)
  for i in range(1, 21):
      for j in range(1, 21):
          print("{0:2d} x {1:2d} = {2:4d}".format(i, j, (i * i)))
  
subject: Test pretty format in 03_io directory