Fastest way to find out if a file exists in S3 (with boto3) - Peterbe.comtl;dr; It's faster to list objects with prefix being the full key path, than to use HEAD to find out of a object is in an S3 bucket. Background I have a piece of code that opens up a user uploaded .zip file and extracts its content. Then it uploads each file into an AWS S3 bucket if the file size is different or if the file didn't exist at all before. It looks like this: for filename, filesize, fi
