Without testing, I am sure it would be slower.
I suppose it would be reasonable if exceptions are raised in multiple
places and the exceptions were given meaningful names.
Best wishes
Rob Cliffe
On 01/03/2022 17:22, om wrote:
How does `try/except` (with raise AppropriateException inside the
block) compare to a len-1 loop?
Om
---- On Tue, 01 Mar 2022 10:04:31 -0600 *python-ideas@python.org *
wrote ----
I have use cases for "do exactly once".
Basically a sequence of actions which can be broken off (when
something goes wrong and the whole process should be aborted, or
when something succeeds and there is no need to try alternatives)
at various points with `break`. Thus avoiding multiple if...then
indentation levels.
Of course it can be spelled as
for _ in '1':
for _ in ['once']:
etc. etc., so this is only a cosmetic need.
Best wishes
Rob Cliffe
On 01/03/2022 15:19, Eric Fahlgren wrote:
As you probably suspect, yes, it comes up every couple of
years. Here's one of the recent threads (there are more, just
search for 'until' in the archives), that might give you some
ideas for how this discussion will progress. :)
https://mail.python.org/archives/list/python-ideas@python.org/thread/EDNARFL2RGOE53SLWPTD5ZLJQOYSVDCR
<https://mail.python.org/archives/list/python-ideas@python.org/thread/EDNARFL2RGOE53SLWPTD5ZLJQOYSVDCR>
On Tue, Mar 1, 2022 at 7:09 AM <lynneandal...@optusnet.com.au
<mailto:lynneandal...@optusnet.com.au>> wrote:
Has anyone considered the idea of adding a "do at least
once" loop to Python? This is frequently referred to as a
do ... while or repeat ... until.
At the moment, it's a bit of a hack to achieve this in
that we do a 'while True: ( do thing ; if cond: ( break )
)'. Since I don't know how to format these messages, I've
used '{' for line-beak-and-indent, ')' for
line-break-and-dedent, and ';' for
line-break-keeping-same-indent-level.
My initial thoughts are that it would be reasonably easy
to add a 'repeat: ( do thing ) until condition' which
would far better specify intent of the loop (despite the
possibility of break, while-true loops give no indication
that it's not an infinite loop.
And using repeat...until will ensure whoever had to add
the code to the Python interpreter wouldn't have any
clashes with the current while loop.
Thoughts, anyone? Anyone? Bueller? :-)
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