S3Bucket = 'bucket' S3KeyPrefix = 'folder/' s3 = boto3.resource('s3') bucket = s3.Bucket(S3Bucket) objs = bucket.meta.client.list_objects_v2(Bucket=bucket.name, Prefix=S3KeyPrefix) csv = '{},{},{}\n'.format('file', 'size_mb', 'date') for o in objs.get('Contents'): key = o.get('Key') size = o.get('Size') date = o.get('LastModified') if key[-4:]=='.mp4': csv += '{},{},{}\n'.format(key, int(size/1024