docs: def write_time_log(logfile, time):
          """Write time log."""
          if os.path.exists(logfile):
              log_status = open(logfile, 'a', encoding='utf-8')
          else:
              log_status = open(logfile, 'w', encoding='utf-8')
              log_status.write('Function Name\tRead Time\tCompute Time\tWrite Time\tTotal Time\t\n')
          log_status.write('%s\t%.5f\t%.5f\t%.5f\t%.5f\t\n' % (time['name'], time['readt'],
                                                               time['computet'],
                                                               time['writet'],
                                                               time['totalt']))
          log_status.flush()
          log_status.close()