How to make an empty generator?

[Stephen Hansen]

This has to be a stupid question, but :)

I have some generators that do stuff, then start yielding results. On
occasion, I don't want them to yield anything ever-- they're only really
"generators" because I want to call them /as/ a generator as part of a
generalized system.

The only way I can figure out how to make an empty generator is:

    def gen():
        # do my one-time processing here

        return
        yield

Is there a better way? The return/yield just makes me flinch slightly. I
tried just raising StopIteration at the end, but of course that didn't work.

TIA,
--S
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