Neil Schemenauer wrote:
The translation of a block-statement could become:
itr = EXPR1 arg = None while True: try: VAR1 = next(itr, arg) except StopIteration: break try: arg = None BLOCK1 except Exception, exc: err = getattr(itr, '__error__', None) if err is None: raise exc err(exc)
That can't be right. When __error__ is called, if the iterator catches the exception and goes on to do another yield, the yielded value needs to be assigned to VAR1 and the block executed again. It looks like your version will ignore the value from the second yield and only execute the block again on the third yield.
So something like Guido's safe_loop() would miss every other yield.
I think Guido was right in the first place, and __error__ really is just a minor variation on __next__ that shouldn't have a separate entry point.
Greg
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