蟒蛇单行

Question

我想要一个单行解决方案在Python中使用以下代码，但是如何？

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

它返回总值。我想要一个班轮，PLZ任何一个帮助我

Answer 1

无需加倍sum()来电

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

Answer 2

您可以将for循环折叠到另一个理解级别：

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