[question] Streaming download equivalent to boto3's StreamingBody from get_object?

[jonathanunderwood]

When needing to process large files from S3 and write them back to S3, a common pattern is to use get_object and then read from the response Body (a StreamingBody instance) as required, and then write back to S3. This means the file can be processed entirely in memory. What is the s3transfer equivalent of this in-memory streamed processing?