我如何获得熊猫每月的第一天和最后一天的值？

import pandas as pd

data = pd.DataFrame({'date': ['2022-01-01', '2022-01-15', '2022-02-01', '2022-02-28', '2022-03-01']})

data['date'] = pd.to_datetime(data['date'])

first_day = data.groupby(data['date'].dt.to_period('M')).first()
last_day = data.groupby(data['date'].dt.to_period('M')).last()

print(first_day)
print(last_day)