code: def paddedInt(i):
      '''
      return a string that contains `i`, left-padded with 0's up to PAD_LEN digits
      '''
      i_str = str(i)
      pad = PAD_LEN - len(i_str)
      return (pad * "0") + i_stf paddedInt(i):
      '''
      return a string that contains `i`, left-padded with 0's up to PAD_LEN digits
      '''
      i_str = str(i)
      pad = PAD_LEN - len(i_str)
      return (pad * "0") + i_str
docs: return a string that contains `i`, left-padded with 0's up to PAD_LEN digits