aws dynamodb update 问题

         table.update_item(
                        Key=_filter,
                        UpdateExpression='set type = :g',
                        ExpressionAttributeValues={
                            ':g': '111'
                        }
                    )

botocore.exceptions.ClientError: An error occurred (ValidationException) when calling the UpdateItem operation: Invalid UpdateExpression: Attribute name is a reserved keyword; reserved keyword: type

• type 是保留关键词
• 也没有象 mysql 加``的语法