chapter_02.py 文件源码

def foo1():
    # pandas????????????????????????
    data = pd.merge(pd.merge(ratings, users), movies)

    # ??????????????
    # ??????DataFrame??????????????????????????
    mean_rating = data.pivot_table('rating', columns='gender', index='title', aggfunc='mean')

    # ?????????250????
    ratings_by_title = data.groupby('title').size()
    active_titles = ratings_by_title.index[ratings_by_title >= 250]
    # ??????????250?????????????????mean_rating???????
    mean_rating = mean_rating.ix[active_titles]
    # ??????????????????F?????
    top_female_ratings = mean_rating.sort_index(by='F', ascending=False)
    print(top_female_ratings)