ค้นหาอีเมลของฝ่ายที่มีรูปแบบปาร์ตี้ยอดนิยม
Find the emails of parties with the most popular party form.
df_party_forms = pd.DataFrame(columns=['form_id']); df_parties = pd.DataFrame(columns=['party_email', 'party_id']); df_party_forms = pd.DataFrame(columns=['party_id', 'form_id'])
popular_form = df_party_forms['form_id'].value_counts().idxmax(); df_parties[df_parties['party_id'].isin(df_party_forms[df_party_forms['form_id'] == popular_form]['party_id'])]['party_email']