code: import io
  import pandas
  
  class HourlyHydrogenCurves:
      
      @property
      def hourly_hydrogen_curves(self):
          
          # get hourly hydrogen curves
          if self._hourly_hydrogen_curves is None:
              self.get_hourly_hydrogen_curves()
          
          return self._hourly_hydrogen_curves
              
      def get_hourly_hydrogen_curves(self):
          """get the hourly hydrogen curves"""
          
          # raise without scenario id
          self._raise_scenario_id()
          
          # prepare post
          headers = {'Connection':'close'}
          post = f'/scenarios/{self.scenario_id}/curves/hydrogen'
          
          # request response and extract data
          resp = self.get(post, headers=headers)
          data = io.StringIO(resp)
          
          # convert data to dataframe and set DateTime
          curves = pandas.read_csv(data, index_col='Time', 
                                   parse_dates=True).asfreq('H')
          curves.index.name = 'DateTime'
          
          # set corresponsing parameter property
          self._hourly_hydrogen_curves = curves
          
          return curves
apis: pandas.read_csv