ลูกค้า Art Turcotte มีการ์ดกี่ใบ?
How many cards does customer Art Turcotte have?
df_customers_cards = pd.DataFrame(columns=['customer_id']); df_customers = pd.DataFrame(columns=['customer_id', 'customer_first_name', 'customer_last_name'])
len(df_customers_cards[df_customers_cards['customer_id'] == df_customers.loc[(df_customers['customer_first_name']=='Art') & (df_customers['customer_last_name']=='Turcotte'), 'customer_id'].values[0]])