List index out of range，python中的电影推荐系统

Question

我正在为电影推荐系统做特征预处理。在jupyter notebook中运行此代码后，我得到了以下错误消息。

from tmdbv3api import Movie
tmdb_movie = Movie()
def get_genre(x):
    genres = []
    result = tmdb_movie.search(x)
    movie_id = result[0].id
    response = requests.get('https://api.themoviedb.org/3/movie/{}?api_key={}'.format(movie_id,tmdb.api_key))
    data_json = response.json()
    if data_json['genres']:
        genre_str = " " 
        for i in range(0,len(data_json['genres'])):
            genres.append(data_json['genres'][i]['name'])
        return genre_str.join(genres)
    else:
        np.NaN

df_2020['genres'] = df_2020['Title'].map(lambda x: get_genre(str(x)))

错误消息：

Traceback (most recent call last)
    <ipython-input-14-fdc91464740e> in <module>
    ----> 1 df_2020['genres'] = df_2020['Title'].map(lambda x: get_genre(str(x)))


IndexError: list index out of range

#shape

df_2020 has shape of 232 by 2.

Answer 1

else块中没有return语句。