code: def update(self, content=None):
          
          if not content:
              return
          if content == 'summary' or 'extended' or 'powerflow':
              self._update_summary(self.system)
          if content == 'extended' or 'powerflow':
              self._update_extended(self.system)
docs: Update values based on the requested content
  
          Parameters
          ----------
          content
  
          Returns
          -------