Is there a simple and quick way to use sum() with non-integer values?

So I can use it like this:

class Foo(object):
    def __init__(self,bar)
        self.bar=bar

mylist=[Foo(3),Foo(34),Foo(63),200]
result=sum(mylist) # result should be 300

I tried overriding __add__ and __int__ etc, but I don't have found a solution yet

EDIT:

The solution is to implement:

 def __radd__(self, other):
    return other + self.bar

as Will suggested in his post. But as always, all roads lead to Rome, but I think this is the best solution since I don't need __add__ in my class

python list sum
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