如何使用boto3从dynamoDB中获取上次插入的记录？

import boto3
from boto3.dynamodb.conditions import Key

dynamodb = boto3.client('dynamodb')

table_name = 'your_table_name'

response = dynamodb.scan(
    TableName=table_name,
    Select='ALL_ATTRIBUTES',
    ScanFilter={
        'your_partition_key': {
            'AttributeValueList': [],
            'ComparisonOperator': 'NOT_NULL'
        }
    },
    Limit=1,
    ConsistentRead=True,
    ReturnConsumedCapacity='NONE',
    ProjectionExpression='your_sort_key',
    ExpressionAttributeNames={
        '#your_sort_key': 'your_sort_key'
    },
    ExpressionAttributeValues={
        ':your_sort_key': {
            'S': 'your_sort_key_value'
        }
    },
    FilterExpression='attribute_exists(your_partition_key) AND #your_sort_key = :your_sort_key',
    ExclusiveStartKey=None
)

if 'Items' in response and len(response['Items']) > 0:
    last_inserted_record = response['Items'][0]
    # 处理上次插入的记录
else:
    # 没有找到上次插入的记录