code: def nPercentile(requestContext, seriesList, n):
      
      assert n, 'The requested percent is required to be greater than 0'
  
      results = []
      for s in seriesList:
          # Create a sorted copy of the TimeSeries excluding None values in the
          # values list.
          s_copy = TimeSeries(s.name, s.start, s.end, s.step,
                              sorted(not_none(s)))
          if not s_copy:
              continue    # Skip this series because it is empty.
  
          perc_val = _getPercentile(s_copy, n)
          if perc_val is not None:
              name = 'nPercentile(%s, %g)' % (s_copy.name, n)
              point_count = int((s.end - s.start)/s.step)
              perc_series = TimeSeries(name, s_copy.start, s_copy.end,
                                       s_copy.step, [perc_val] * point_count)
              perc_series.pathExpression = name
              results.append(perc_series)
      return results
docs: Returns n-percent of each series in the seriesList.