Fix contestant reference thanks elpy

venture/app.py

@@ -35,7 +35,7 @@ def on_join_contestant(data):
 
 @socketio.on('buzz')
 def on_buzz():
-    contestant = session.game[request.sid]
+    contestant = session.game.contestants[request.sid]
     if contestant.locked:
         return
     emit('contestant-buzzed', {'sid': request.sid}, to=session.room)