Pandas DataFrame의 각 주 내 사무실당 매출 비율을 계산하는 방법은 무엇입니까?

import pandas as pd

# Create the DataFrame
df = pd.DataFrame({'state': ['CA', 'WA', 'CO', 'AZ'] * 3,
                   'office_id': list(range(1, 7)) * 2,
                   'sales': [np.random.randint(100000, 999999)
                             for _ in range(12)]})

# Calculate the sum of sales for each state
total_sales_by_state = df.groupby('state')['sales'].transform('sum')

# Calculate the percentage of sales for each office
df['sales_percent'] = 100 * df['sales'] / total_sales_by_state