擅长:python、mysql、java
<p>我得到了答案:</p>
<pre><code>genres = pd.DataFrame(genres.genre.str.split(',', expand=True).stack(), columns= ['genre'])
genres = genres.reset_index(drop = True)
genre_count = pd.DataFrame(genres.groupby(by = ['genre']).size(),columns = ['count'])
genre_count = genre_count.reset_index()
</code></pre>