[Python-Dev] Simple coroutines? (original) (raw)

Greg Ewing greg at cosc.canterbury.ac.nz
Wed Aug 25 05:32:28 CEST 2004

"Clark C. Evans" <cce at clarkevans.com>:

In fact, one could implement it using a SuspendIteration exception, in addition to a StopIteration.

I don't think this can be done quite right by raising an exception in the normal way, because you don't want 'finally' clauses to be triggered.

You'd definately want to mix them. For example, a 'cooperator' would be reading from a socket, it could do one of three things:

yield the next line from the sender raise StopIteration if the socket closed raise SuspendIteration if the read() is blocked

Hmmm. It seems that generation and cooperation are really orthogonal concepts -- you may want something that is both a generator and a cooperator. My proposal doesn't allow for this. I will have to do some more thinking...

Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg at cosc.canterbury.ac.nz +--------------------------------------+

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