ปีใดที่ผลิตมีประเภท 1b n2 และมีปริมาณ 10
Which Year(s) of manufacture has a Type of 1b n2, and a Quantity of 10?
df = pd.DataFrame(columns=['year_s__of_manufacture', 'type', 'quantity'])
df[(df['type']=='1b n2')& (df['quantity']==10)]['year_s__of_manufacture']