code: def _changeMs(self, line):
          
          # use the position of the last space instead
          try:
              last_space_pos = line.rindex(' ')
          except ValueError:
              return line
          else:
              end_str = line[last_space_pos:]
              new_string = line
              if end_str[-2:] == 'ms' and int(end_str[:-2]) >= 1000:
                  # isolate the number of milliseconds
                  ms = int(end_str[:-2])
                  # create the new string with the beginning part of the
                  # log with the new ms part added in
                  new_string = (line[:last_space_pos] +
                                ' (' + self._msToString(ms) + ')' +
                                line[last_space_pos:])
              return new_string
docs: Change the ms part in the string if needed.