I've just submitted patch 1223381 (http://python.org/sf/1223381), which implements code and test changes for:
* yield expressions * bare yield (short for yield None) * yield in try/finally * generator.send(value) (send value into generator; substituted for PEP 342's next(arg)) * generator.throw(typ[,val[,tb]]) (raise error in generator) * generator.close() * GeneratorExit built-in exception type * generator.__del__ (well, the C equivalent) * All necessary mods to the compiler, parser module, and Python 'compiler' package to support these changes. It was necessary to change a small part of the eval loop (well, the initialization, not the loop) and the gc module's has_finalizer() logic in order to support a C equivalent to __del__. Specialists in these areas should probably scrutinize this patch! There is one additional implementation detail that was not contemplated in either PEP. in order to prevent used-up generators from retaining unnecessary references to their frame's contents, I set the generator's gi_frame member to None whenever the generator finishes normally or with an error. Thus, an exhausted generator cannot be part of a cycle, and it releases its frame object sooner than in previous Python versions. For generators used only in a direct "for" loop, this makes no difference, but for generators used with the iterator protocol (i.e. "gen.next()") from Python, this avoids stranding the generator's frame in a traceback cycle. Anyway, your comments/questions/feedback/bug reports are welcome. _______________________________________________ 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
