print(a)
A
B
A
B
print(b)
A
B
C
現在想用groupby.count方法，按照b的分類，統計a的各類數量。
理想的結果應當是：A數量2，B數量2，C數量0。老是弄不好，請指教！
uj5u.com熱心網友回復：
https://blog.csdn.net/weixin_45903952/article/details/104841303?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522160022704319195188323770%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=160022704319195188323770&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_v2~rank_blog_default-5-104841303.pc_v2_rank_blog_default&utm_term=group&spm=1018.2118.3001.4187參考看一下吧
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