Topar ใดมีประเทศสหรัฐอเมริกาและมีผู้เล่นของ Dave Stockton?
which To par has a Country of united states, and a Player of dave stockton?
df = pd.DataFrame(columns=['to_par', 'country', 'player'])
df[(df.country == 'united states') & (df.player == 'dave stockton')] ['to_par']