code: def getextensibleindex(self, key, name):
          
          return getextensibleindex(
              self.idfobjects, self.model, self.idd_info,
              key, name)
docs: Get the index of the first extensible item.
  
          Only for internal use. # TODO : hide this
  
          Parameters
          ----------
          key : str
              The type of IDF object. This must be in ALL_CAPS.
          name : str
              The name of the object to fetch.
  
          Returns
          -------
          int