Ordering pandas dataframe column in ascending order

Question

I have tried to find a specific answer to this question but no luck.

I have created a groupby dataframe where I have found the mean rating of a series of movies. I now have the movie id's as the index, but I want to order all the ratings with the highest rating at the top, lowest at the bottom. I have tried the sort and sort_value function to no avail.

r_cols = ['user_id', 'movie_id', 'rating', 'unix_timestamp']
ratings = pd.read_csv(
    'http://files.grouplens.org/datasets/movielens/ml-100k/u.data', 
    sep='\t', names=r_cols)

grouped_ratings=ratings['rating'].groupby(ratings['movie_id'])
average_rating=grouped_ratings.mean()

Answer 1

按等级降序排序

average_rating.sort_values(ascending=False)