Used [ ] in retrieving element from lists. Unfortunately that gave an error on mission 3 (Lists and Loops) in introduction to python course. However when I had changed [ ] to ( ), I got the correct answer.
Link to mission page; https://app.dataquest.io/m/312/lists-and-for-loops/4/retrieving-multiple-list-elements
Here is the example;
avg_rating =(fb_rating_data + insta_rating_data + pandora_rating_data) / 3
avg_rating =[fb_rating_data + insta_rating_data + pandora_rating_data] / 3