code: def _parse_s3_file(original_file):
      
      bits = original_file.replace('s3://', '').split("/")
      bucket = bits[0]
      object_key = "/".join(bits[1:])
      return bucket, object_key
docs: Convert `s3://bucketname/path/to/file.txt` to ('bucketname', 'path/to/file.txt')