code: def save_item(self, item):
          
          try:
              self.dynamodb_client.update_item(**item)
          except botocore.exceptions.ClientError as error:
              handle_constraint_violation(error)
docs: Save an object to DynamoDB.
  
          :param item: Unpacked into kwargs for :func:`boto3.DynamoDB.Client.update_item`.
          :raises bloop.exceptions.ConstraintViolation: if the condition (or atomic) is not met.