อะไรคือคะแนนสูงสุดก่อนปี 1953 ด้วยแชสซีของ Ferrari 375/50?
What is the most points earlier than 1953 with a Ferrari 375/50 chassis?
df = pd.DataFrame(columns=['points', 'year', 'chassis'])
df.loc[(df['year'] < 1953) & (df['chassis'] == 'ferrari 375/50'), 'points'].max()