On Wed, Jul 15, 2020 at 05:45:05AM +0000, Steve Barnes wrote:
> Can I suggest that for loops the `else` would be a lot clearer if it
> was spelt `finally` as was done for PEP-0341 for try blocks and that
> we might possibly need one or more `on_…` clauses such as `on_break`
> and `on_finish` I think that this would be a lot clearer:
Sorry Steve, "finally" would be a terrible name because it behaves
nothing like try...finally. In try blocks, the finally block is *always*
executed, even if you raise, even if you return.
(To be precise, there are odd and unusual cases where finally won't be
executed, such as if the interpreter process is `kill -9`'ed, or if a
power surge fries the CPU. But under normal processing, finally always
runs.)
But the for...finally (renamed from for...else) is not like that. If
anything, it's the opposite of finally: it is a block designed to be
skipped, not a block designed to always run.
Any of `break`, `return` or `raise` will cause the for...finally clause
to be skipped. So we would be swapping one form of confusion to another
("why is my finally clause not executed?").
--
Steven
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