ค้นหาจำนวนสมาชิกของชมรม "Pen and Paper Gaming"
Find the number of members of club "Pen and Paper Gaming".
club = pd.DataFrame(columns=['clubid', 'clubname']); member_of_club = pd.DataFrame(columns=['clubid', 'stuid']); student = pd.DataFrame(columns=['stuid'])
member_of_club[member_of_club['clubid'].isin(club[club['clubname'] == 'Pen and Paper Gaming']['clubid'])]['stuid'].count()