CDK Table DynamoDB, Stream configuration Python

I assume you are asking how to do so in CDK, with Terraform as your background:

from aws_cdk import aws_dynamodb as dynamodb

...

my_dynamo_table = dynamodb.Table(
    self, "LogicalIDForThisTable",
    ...
    stream=dynamodb.StreamViewType.NEW_AND_OLD_IMAGES
)

In order to use said stream, you need to create an DynamoEventSource object to pass to whatever resource will be consuming the stream:

https://docs.aws.amazon.com/cdk/api/v2/python/aws_cdk.aws_lambda_event_sources/DynamoEventSource.html

ie:

from aws_cdk import aws_lambda_event_sources as event_source

...

my_dynamo_event_stream = event_source.DynamoEventSource(
    my_dynamo_table,
    starting_position=aws_lambda.StartingPosition.TRIM_HORIZON,
    batch_size=25,
    retry_attempts=10
)

my_lambda.add_event_source(my_dynamo_event_stream)