title: How to check if local file is same as S3 object without downloading it with boto3?
body: <p><strong>How to check if local file is same as file stored in S3 without downloading it?</strong> To avoid downloading large files again and again. S3 objects have e-tags, but they are difficult to compute if file was uploaded in parts and solution from this <a href="https://stackoverflow.com/questions/6591047/etag-definition-changed-in-amazon-s3/28877788#28877788">question</a> doesn't seem to work. Is there some easier way avoid unnecessary downloads? </p>