Guido van Rossum <[EMAIL PROTECTED]> wrote: > The discussion about PEP 343 reminds me of the following. Bram Cohen > pointed out in private email that, before PEP 342, there wasn't a big > need for a shortcut to pass control to a "sub-generator" because the > following for-loop works well enough: > > def main_generator(): > ... > for value in sub_generator(): > yield value
For small values of `well enough`. I sometimes override a generator in a subclass and it sucks to add the loop just because the derived generator wants to add a value at the beginning or end. > but now that yield can return a value, that value might have to be > passed into sub_generator(), not to mention of exceptions. I'm sure > there's a way to write that (although I haven't found the time to > figure it out) but I expect it to be cumbersome and subtle. I don't > think a helper function can be created to solve this problem, because > the yield syntax is essential. > > Bram suggested the following syntax: > > def main_generator(): > ... > yieldthrough sub_generator() > > I'm not keen on that particular keyword, but I do believe a syntactic > solution is needed, if the problem is important enough to be solved. How about: def main_generator(): ... yield * sub_generator() Ducking-ly yrs, -- Christian Tanzer http://www.c-tanzer.at/ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com