Jacob Holm wrote:
One problem is that if the generator gets None from a yield, it has no way of knowing whether it came from a next() or a send(None), This is only a problem with the recursive implementation though, isn't it?
It's a problem when trying to specify the semantics in terms of an expansion into currently valid Python. It's not necessarily a problem in the actual implementation, which isn't constrained that way.
I still (see example in another thread) think that a missing 'send' should be treated as a 'next'. To me, the "communicating directly with the caller" bit is less important than the argument that the caller is still talking to a generator that *has* a send but may ignore the values sent.
Yes, I'm starting to think that way, too. -- Greg