AWS Serverless Application Model: Create S3 Event to Lambda - amazon-web-services

Question

I would like to use the Serverless Application Model(SAM) and CloudFormation to create a simple lambda function which gets triggered when an object is created in a S3 bucket(e.g. thescore-cloudfront-trial). How do I enable the trigger from the S3 bucket to the Lambda Function? Below is my python3 boto3 code.
region = 'us-east-1'
import boto3
test_lambda_template = {
'AWSTemplateFormatVersion': '2010-09-09',
'Transform': 'AWS::Serverless-2016-10-31',
'Resources': {
'CopyS3RajivCloudF': {
'Type': 'AWS::Serverless::Function',
'Properties': {
"CodeUri": 's3://my-tmp/CopyS3Lambda',
"Handler": 'lambda.handler',
"Runtime": 'python3.6',
"Timeout": 300,
"Role": 'my_existing_role_arn'
},
'Events': {
'Type': 'S3',
'Properties': {
"Bucket": "thescore-cloudfront-trial",
"Events": 's3:ObjectCreated:*'
}
}
},
'SrcBucket': {
"Type": "AWS::S3::Bucket",
"Properties": {
"BucketName": 'thescore-cloudfront-trial',
}
}
}
}
conf = config.get_aws_config('development')
client = aws.client(conf, 'cloudformation', region_name=region)
response = client.create_change_set(
StackName='RajivTestStack',
TemplateBody=json.dumps(test_lambda_template),
Capabilities=['CAPABILITY_IAM'],
ChangeSetName='a',
Description='Rajiv ChangeSet Description',
ChangeSetType='CREATE'
)
response = client.execute_change_set(
ChangeSetName='a',
StackName='RajivTestStack',
)

Answer 1

I figured it out with caveats
Caveat 1: The trigger notification will show up in S3 console but not in the Lambda console. My existing python deploy scripts using boto3 s3 and lambda clients(which I want to replace) show the notification in both consoles.
Caveat 2: For monitoring, I see my lambda trigger only when I switch to see the lambda alias view. But I haven't specified an alias for my lambda. So I don't know why I don't see it in the non alias view(just seeing the LATEST version)
I had to modify the Events key like this:
'Events': {
'RajivCopyEvent': {
'Type': 'S3',
'Properties': {
"Bucket": {"Ref": "SrcBucket"},
"Events": "s3:ObjectCreated:*"
}
}
}