code: def _validate_attribute_values_are_ddb_items(instance, attribute, value):  # pylint: disable=unused-argument
      
      for data in value.values():
          if len(list(data.values())) != 1:
              raise TypeError('"{}" values do not look like DynamoDB items'.format(attribute.name))
docs: Validate that dictionary values in ``value`` match the structure of DynamoDB JSON
      items.
  
      .. note::
  
          We are not trying to validate the full structure of the item with this validator.
          This is just meant to verify that the values roughly match the correct format.