Singleton tuplization of a set wrapper class's elements

gistfile1.py

class FooIterator:
    def __init__(self, underlyingIter):
        self.underlying = underlyingIter

    def __iter__(self):
        return self

    def next(self):
        try:
            return (self.underlying.next(),)
        except StopIteration:
            raise

class Foo:
    def __init__(self, data):
        self.data = set(data)

    def __iter__(self):
        return self.data.__iter__()

    def tuplize(self):
        return FooIterator(self.__iter__())