Tim Peters <[email protected]> added the comment:
I agree Raymond's `before_and_after()` looks like an elegant, efficient, and
usable approach to this.
One minor nit: there's no need for the `iter()` call in:
yield from iter(transition)
Indeed, it confused me at first, because `yield from x` does its own `iter(x)`
call under the covers, and since everyone knows that ;-) , I wondered what deep
trickery calling it again was intended to pull off.
But I persuaded myself there was no such subtle intent - it's just redundant.
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nosy: +tim.peters
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