How to explain coroutine in Tornado and Python? -

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i know coroutine in python use get = yield ret , callee.send() , callee.next(). havn't find above things such call.send() in tornado source code gen.py. how explain coroutine in tornado easy understand way? without bigger picture, can't understand tornado did.

gen.py does call send(), in runner.run(), not in engine() or coroutine() might expect.

it seems engine() , coroutine() evaluate wrapped function see whether returns generator. if does, calls runner.run() on result, internally seems loop on send(). it's not obvious it's doing though...


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