code: def delete_from_index(self, key):
          "Delete references from the index of the key old value(s)."
          old_value = self.data[key]
          keys = set(old_value.keys()).intersection(self.indexes.keys())
          for index_name in keys:
              if old_value[index_name] in self.indexes[index_name]:
                  del self.indexes[index_name][old_value[index_name]f delete_from_index(self, key):
          "Delete references from the index of the key old value(s)."
          old_value = self.data[key]
          keys = set(old_value.keys()).intersection(self.indexes.keys())
          for index_name in keys:
              if old_value[index_name] in self.indexes[index_name]:
                  del self.indexes[index_name][old_value[index_name]]
docs: Delete references from the index of the key old value(s).