python's sum() and non-integer values

Question

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)
               


        

Answer 1

Try:

import operator
result=reduce(operator.add, mylist)

sum() works probably faster, but it is specialized for builtin numbers only. Of course you still have to provide a method to add your Foo() objects. So full example:

class Foo(object):
    def __init__(self, i): self.i = i
    def __add__(self, other):
        if isinstance(other, int):
            return Foo(self.i + other)
        return Foo(self.i + other.i)
    def __radd__(self, other):
        return self.__add__(other)

import operator
mylist = [Foo(42), Foo(36), Foo(12), 177, Foo(11)]
print reduce(operator.add, mylist).i