使用AWS Lambda函数设置触发器，该函数将在配置的时间间隔后处理删除。

创建一个Lambda函数，并将其配置为 S3 存储桶的触发器。此函数将运行以下代码示例，以删除在 x 天后最后修改的文件。

import boto3
from datetime import datetime, timezone, timedelta

# Set the time interval for file deletion
interval_days = 7

# Get S3 bucket and key from S3 event
def get_bucket_key(event):
    bucket = event['Records'][0]['s3']['bucket']['name']
    key = event['Records'][0]['s3']['object']['key']
    return bucket, key

# Calculate the time delta between now and last modified time
def get_time_delta(event_time):
    now = datetime.now(timezone.utc)
    mod_time = datetime.strptime(event_time,'%Y-%m-%dT%H:%M:%S.%fZ').replace(tzinfo=timezone.utc)
    delta = now - mod_time
    return delta, now

# Delete the S3 object
def delete_object(bucket, key):
    s3 = boto3.resource('s3')
    obj = s3.Object(bucket, key)
    obj.delete()

def lambda_handler(event, context):
    bucket, key = get_bucket_key(event)
    delta, now = get_time_delta(event['Records'][0]['eventTime'])

    if delta > timedelta(days=interval_days):
        delete_object(bucket, key)
        print('File was deleted: s3://' + bucket + '/' + key)
    else:
        print('File was not deleted: s3://' + bucket + '/' + key + ', last modified ' + str(now - delta))

配置 Lambda 函数的基础设置、触发器、代码和权限。

将所需的桶名称和文件类型添加到 Lambda 函数中。

在 AWS S3 存储桶内上传文件，然后等待指定天数，Lambda 函数将自动删除最后修改的文件。