Python one-liner

I want a one-liner solution in Python of the following code, but how?

total = 开发者_如何学编程0
for ob in self.oblist:
    total += sum(v.amount for v in ob.anoutherob)

It returns the total value. I want it in a one-liner. How can I do it?

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There isn't any need to double up on the sum() calls:

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

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You can just collapse the for loop into another level of comprehension:

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