attempt to handle 403 errors

delojza.py

@@ -24,6 +24,7 @@ import requests
 import telegram
 import youtube_dl
 from telegram.ext import Updater, CommandHandler, MessageHandler
+from youtube_dl import DownloadError
 from youtube_dl.version import __version__ as YTDL_VERSION
 
 
@@ -189,7 +190,17 @@ class DelojzaBot:
             }]
         filenames = []
         with youtube_dl.YoutubeDL(ytdl) as ytdl:
+            while True:
+                try:
                     ytdl.download(urls)
+                    break
+                except DownloadError as exc:
+                    if '403' in str(exc):
+                        self.logger.warning("Received a 403!")
+                        if self.markov:
+                            message.reply_text(self.markov.make_sentence)
+                    else:
+                        raise exc
             for info in [ytdl.extract_info(url, download=False) for url in urls]:
                 filename = ytdl.prepare_filename(info)
                 globbeds = glob(os.path.splitext(filename)[0] + '.*')