code: def get_object_index(self, key):
          
          defns = yield from self.get_definitions()
  
          for x in defns:
              if key in x and "objectIndex" in defns[x]:
                  return defns[x]["objectIndex"]
  
          return None
docs: |coro|
  
          Mainly for internal use with get_operator,
          returns the "location" index for the key in the definitions
  
          Returns
          -------
          str
              the object's location index