ผู้มาใหม่ Joseph H. Bottum (r) มีที่นั่งว่างกี่ที่นั่ง?
How many vacant seats were filled by newcomer Joseph H. Bottum (r)?
df = pd.DataFrame(columns=['vacator', 'successor'])
df[df['successor'] == 'Joseph H. Bottum (R)']['vacator'].count()