[Python-Dev] PEP 340: Deterministic Finalisation (new PEP draft, either a competitor or update to PEP 340)

[Greg Ewing]

Ron Adam wrote:
> There seems to be some confusion as to weather or 
> not 'for's will do finalizing.  So I was trying to stress I think 
> regular 'for' loops should not finalize. They should probably give an 
> error if an object with an try-finally in them or an __exit__ method. 

But if the for-loop can tell whether the iterator
needs finalizing or not, why not have it finalize
the ones that need it and not finalize the ones
that don't? That would be backwards compatible,
since old for-loops working on old iterators would
work as before.

Greg