[Python-Dev] Re: anonymous blocks (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Tue Apr 26 15:44:30 CEST 2005

Reinhold Birkenfeld wrote:

Nick Coghlan wrote:

Guido van Rossum wrote: [snip]

- I think there's a better word than Flow, but I'll keep using it until we find something better. How about simply reusing Iteration (ala StopIteration)? Pass in 'ContinueIteration' for 'continue' Pass in 'BreakIteration' for 'break' Pass in 'AbortIteration' for 'return' and finalisation. And advise strongly against intercepting AbortIteration with anything other than a finally block. Hmmm... another idea: If break and continue return keep exactly the current semantics (break or continue the innermost for/while-loop), do we need different exceptions at all? AFAICS AbortIteration (+1 on the name) would be sufficient for all three interrupting statements, and this would prevent misuse too, I think.

No, the iterator should be able to keep state around in the case of BreakIteration and ContinueIteration, whereas AbortIteration should shut the whole thing down.

In particular "VAR = yield None" is likely to become syntactic sugar for: try: yield None except ContinueIteration, exc: VAR = ContinueIteration.value

We definitely don't want that construct swallowing AbortIteration.

Cheers, Nick.

-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia

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