code: def get_value(self, query):
          
          indices = self.get_dimension_indices(query)
          index = self.get_value_index(indices)
          value = self.get_value_by_index(index)
          return value
docs: Converts a dimension/category list of dicts into a data value \
             in three steps.
  
         Args:
             query(list): list of dicts with the desired query.
  
         Returns:
             value(float): numeric data value.