code: def get_series_info(self, series_id):
          
          url = "%s/series?series_id=%s" % (self.root_url, series_id)
          root = self.__fetch_data(url)
          if root is None or not len(root):
              raise ValueError('No info exists for series id: ' + series_id)
          info = pd.Series(root.getchildren()[0].attrib)
          return info
docs: Get information about a series such as its title, frequency, observation start/end dates, units, notes, etc.
  
          Parameters
          ----------
          series_id : str
              Fred series id such as 'CPIAUCSL'
  
          Returns
          -------
          info : Series
              a pandas Series containing information about the Fred series