diff --git a/code/sum.py b/code/sum.py
index 1d8a977..f352e15 100644
--- a/code/sum.py
+++ b/code/sum.py
@@ -212,7 +212,8 @@ def download_video_srt(subs):
         result = ydl.extract_info("{}".format(url), download=True)
         movie_filename = ydl.prepare_filename(result)
         subtitle_info = result.get("requested_subtitles")
-        subtitle_language = subtitle_info.keys()[0]
+        subtitle_language = list(subtitle_info.keys())
+        subtitle_language = subtitle_language[0]
         subtitle_ext = subtitle_info.get(subtitle_language).get("ext")
         subtitle_filename = movie_filename.replace(".mp4", ".%s.%s" %
                                                    (subtitle_language,