At 04:04 PM 10/20/2005 -0400, Jeremy Hylton wrote:
On 10/20/05, Guido van Rossum <guido@python.org> wrote:
Whoa, folks! Can I ask the gentlemen to curb their enthusiasm?
PEP 343 is still (back) on the drawing table, PEP 342 has barely been implemented (did it survive the AST-branch merge?), and already you are talking about adding more stuff. Please put on the brakes!
Yes. PEP 342 survived the merge of the AST branch. I wonder, though, if the Grammar for it can be simplified at all. I haven't read the PEP closely, but I found the changes a little hard to follow. That is, why was the grammar changed the way it was -- or how would you describe the intent of the changes?
The intent was to make it so that '(yield optional_expr)' always works, and also that [lvalue =] yield optional_expr works. If you can find another way to hack the grammar so that both of 'em work, it's certainly okay by me. The changes I made were just the simplest things I could figure out to do. I seem to recall that the hard part was the need for 'yield expr,expr' to be interpreted as '(yield expr,expr)', not '(yield expr),expr', for backward compatibility reasons.