如何使用Python中的AWS-cdk在您的存储桶中发生某些事件时，如何设置Amazon S3通知以接收通知？当我使用下面的代码时，我可以设置订阅。但是，当文件上传到S3时，它不会向我发送电子邮件。当我在snS控制台中手动更新访问策略时，它可以工作，但是我不知道如何在cdk中实现它。我还附上了我要实现的snS访问策略，但我没有做到这一点。这是我的cdk代码段：

        #snS

        sf_topic = aws_sns.Topic(
            self,"MyTopic",display_name="My Topic"
        )

        email=aws_sns_subscriptions.EmailSubscription("example@email.com")
        sf_topic.add_subscription(subscription=email)

        notification = aws_s3_notifications.snsDestination(sf_topic)

        sf_bucket.add_event_notification(aws_s3.EventType.OBJECT_CREATED,notification)

{
 "Version": "2008-10-17","Id": "example-ID","Statement": [
  {
   "Sid": "s3-event-notifier","Effect": "Allow","Principal": {
     "Service": "s3.amazonaws.com"
   },"action": [
    "snS:Publish"
   ],"Resource": "<UPDATE-YOUR-snS-ARN-HERE>","Condition": {
      "ArnLike": {          
      "aws:SourceArn": "arn:aws:s3:*:*:<UPDATE-YOUR-BUCKET-NAME-HERE>"
    }
   }
  }
 ]
}