如何在python中使用groupby进行具有多个条件的求和？

我能处理季节=冬季的奇异条件。 我如何在多个条件下执行此操作？请查看我试图在Python上实现的SQL等价物

## filter group by 
df.groupby('Season')['Cost'].sum()['Winter']

---

您可以先筛选数据，然后执行groupby

Select 
Season
,sum(cost) 
from df 
where Season in ('Winter','Summer')
group by Season
and 
Select 
Season
,sum(cost) 
from df 
where Season in ('Winter','Summer')
and Region ='Europe'
group by Season

---

您可以先筛选数据，然后执行groupby

Select 
Season
,sum(cost) 
from df 
where Season in ('Winter','Summer')
group by Season
and 
Select 
Season
,sum(cost) 
from df 
where Season in ('Winter','Summer')
and Region ='Europe'
group by Season

你能提供一个吗？你能提供一个吗？