蟒蛇單行

Question

我想要一個單行解決方案在Python下面的代碼但是如何？

total = 0
for ob in self.oblist:
    total+=sum(v.amount for v in ob.anoutherob)

它返回總值。 我想要一個班輪，任何人幫助我

Answer 1

無需加倍sum()調用

total = sum(v.amount for ob in self.oblist for v in ob.anotherob)

Answer 2

您可以將for循環折疊到另一個理解級別：

total = sum(sum(v.amount for v in ob.anotherob) for ob in self.oblist)