On Mon, Aug 23, 2004 at 11:56:04AM -0400, Phillip J. Eby wrote:
| >1. The PEP would introduce a new 'builtin' class called 'Cooperate'
| >
| >2. Generator semantics would be altered so that 'yield X', where X
| > is an instance of Cooperate, would automagically propigate to
| > the outer-most non-generator.
|
| Perhaps you mean "inner-most"?
Yes. The top-most non-generator on the stack.
| It doesn't seem to me to actually help anything. You can already do this
| using a simple wrapper object that maintains a stack of active
| generators, as I do in 'peak.events'.
Could you provide an example? The problem this proposal solves is
straight-foward -- it is tedious and slow to have intermediate
generators do stuff like:
def middle():
""" intermediate generator _only_ sees one and two """
for x in top():
! if isinstance(x,X):
! yield x
print "middle", x
yield x
This extra step is tedious and also slow; especially if one has lots of
yield statements that cooperate. It could be standardized and made a
bit snappier if it was built-in behavior. This is an 80/5 proposal.
One gets 80% of the happiness, with 5% of the pain.
| I was hoping that you had actually come up with a solution for the more
| complex problem of suspending *non* generator functions, in a way that
| would work with CPython. :(
Yes, I know. I'm trying to avoid this much harder problem.
Clark
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