คะแนนต่ำสุดโดยแพ้ 20 และน้อยกว่า 1 คืออะไร?
What is the lowest Points with an against of 20 and less than 1 lost?
df = pd.DataFrame(columns=['points', 'against', 'lost'])
df[(df['against'] == '20') & (df['lost'] < '1')]['points'].min()