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
On Tue, Mar 1, 2022 at 7:09 AM
<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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