example code for a coroutine generator

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Does that actually use coroutines anywhere, though?  It just looks like generators to me.

numbers are sent to it, one at a time.  numbers are received from it, one at a time.  send it a None and it does nothing with it (yeah, not much different than send a 0 value).  but this is using the send method.  i personally don't like the asymmetry.  but i don't see an easy way to make it symmetrical in python.

i do wonder about how python figures it to be a coroutine and blocks the initial call.  i can envision code that can dynamically decide whether to do yield, or not, and accept sent data, or not.  there is also the issue of using a proxy generator (a function to do the yield() and/or send() call for you).  this stuff was complex enough in C.