pandasでgroupby@Python

faq_datas = pd.read_csv('data/kansentaisakufaq20210315.csv', \
                      encoding = "shift-jis", header=None, skiprows=[0,1,2], names=['no', 'category1', 'category2', 'question', 'answer'])
faq_datas

faq_datas.groupby('category1').count()