Python一林

Question

我想在Python中得到一个一行代码的解决方案，但是如何实现呢？

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

它返回总值。我要一个班轮，请任何人帮我

Answer 1

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)

Answer 2

不需要在sum()调用上加倍

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