code: def get_item_position(self, analysis_uid):
          
          str_position = self.uids_strpositions.get(analysis_uid, "")
          tokens = str_position.split(":")
          if len(tokens) != 2:
              return None
          return [to_int(tokens[0]), to_int(tokens[1])]
docs: Returns a list with the position for the analysis_uid passed in
          within the current worksheet in accordance with the current layout,
          where the first item from the list returned is the slot and the second
          is the position of the analysis within the slot.
  
          :param analysis_uid: uid of the analysis the position is requested
          :return: the position (slot + position within slot) of the analysis
          :rtype: list