22.04.20 08:11, Greg Ewing пише:
I don't this should be a guarantee, in this or any similar situation. The only purpose for the value in a StopIteration is to provide a return value for yield-from when the thing being delegated to is a generator. If you're yielding from something that's not a generator, and not specifically designed to mimic one, then all bets are off.
Several years ago there was a discussion about extending itertools to support generators (passing throw the return value, supporting send() and throw(), etc). This idea was rejected at that time due to a lack of good use cases.
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