On Tue, Mar 1, 2022 at 4:51 PM Steven D'Aprano wrote:
> Then Python is the wrong language for you, because it uses exceptions to
> direct control flow *wink*
>
> The iteration protocol uses StopIteration to end iteration. The older
> sequence protocol uses IndexError for the same purpose.
>
I
On Wed, 2 Mar 2022 at 18:35, Rob Cliffe via Python-ideas
wrote:
>
>
>
> On 02/03/2022 02:01, Chris Angelico wrote:
> > This doesn't obscure the control flow any more than a 'while' loop,
> It certainly does! I see a decorated function. Nothing tells me that
> the decorator actually *calls* the
On 02/03/2022 02:01, Chris Angelico wrote:
On Wed, 2 Mar 2022 at 12:33, Rob Cliffe via Python-ideas
wrote:
On 02/03/2022 01:02, Chris Angelico wrote:
On Wed, 2 Mar 2022 at 10:32, Rob Cliffe via Python-ideas
wrote:
On 01/03/2022 22:25, Chris Angelico wrote:
On Wed, 2 Mar 2022 at 09:24,
On Wed, 2 Mar 2022 at 17:08, Greg Ewing wrote:
>
> > On Wed, 2 Mar 2022 at 09:58, Rob Cliffe via Python-ideas
> > wrote:
> >>
> >> Without testing, I am sure it would be slower.
>
> Does that mean if you do test it, it'll be faster? :-)
>
Wait, the reason my code is slow is that I don't have
On Wed, 2 Mar 2022 at 09:58, Rob Cliffe via Python-ideas
wrote:
Without testing, I am sure it would be slower.
Does that mean if you do test it, it'll be faster? :-)
--
Greg
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On Wed, 2 Mar 2022 at 12:33, Rob Cliffe via Python-ideas
wrote:
>
>
>
> On 02/03/2022 01:02, Chris Angelico wrote:
> > On Wed, 2 Mar 2022 at 10:32, Rob Cliffe via Python-ideas
> > wrote:
> >>
> >>
> >> On 01/03/2022 22:25, Chris Angelico wrote:
> >>> On Wed, 2 Mar 2022 at 09:24, Steven D'Aprano
On 02/03/2022 01:02, Chris Angelico wrote:
On Wed, 2 Mar 2022 at 10:32, Rob Cliffe via Python-ideas
wrote:
On 01/03/2022 22:25, Chris Angelico wrote:
On Wed, 2 Mar 2022 at 09:24, Steven D'Aprano wrote:
On Tue, Mar 01, 2022 at 04:04:31PM +, Rob Cliffe via Python-ideas wrote:
I have
On Wed, 2 Mar 2022 at 10:32, Rob Cliffe via Python-ideas
wrote:
>
>
>
> On 01/03/2022 22:25, Chris Angelico wrote:
> > On Wed, 2 Mar 2022 at 09:24, Steven D'Aprano wrote:
> >> On Tue, Mar 01, 2022 at 04:04:31PM +, Rob Cliffe via Python-ideas
> >> wrote:
> >>
> >>> I have use cases for "do
On 2/03/22 12:50 pm, Rob Cliffe via Python-ideas wrote:
As I see it, the original meaning of an exception (in whatever language)
is "something unexpected has happened" or "something has gone wrong".
Using exceptions for flow control has always been acceptable in
Python. The iterator protocol
On Tue, Mar 01, 2022 at 11:50:42PM +, Rob Cliffe via Python-ideas wrote:
> It doesn't feel right to me to use exceptions purely to direct control
> flow. YMMV.
Then Python is the wrong language for you, because it uses exceptions to
direct control flow *wink*
The iteration protocol uses
On 01/03/2022 23:57, Ben Rudiak-Gould wrote:
On Tue, Mar 1, 2022 at 2:23 PM Steven D'Aprano
wrote:
try:
do_this()
if condition: raise MyBreak
do_that()
if condition: raise MyBreak
do_next_step()
if condition:
On Tue, Mar 1, 2022 at 2:23 PM Steven D'Aprano wrote:
> try:
> do_this()
> if condition: raise MyBreak
> do_that()
> if condition: raise MyBreak
> do_next_step()
> if condition: raise MyBreak
> do_last_step()
> except MyBreak:
>
On 01/03/2022 22:25, Chris Angelico wrote:
class MyBreak(Exception):
pass
try:
do_this()
if condition: raise MyBreak
do_that()
if condition: raise MyBreak
do_next_step()
if condition: raise MyBreak
On 01/03/2022 22:25, Chris Angelico wrote:
On Wed, 2 Mar 2022 at 09:24, Steven D'Aprano wrote:
On Tue, Mar 01, 2022 at 04:04:31PM +, Rob Cliffe via Python-ideas wrote:
I have use cases for "do exactly once".
Basically a sequence of actions which can be broken off (when something
goes
On Wed, 2 Mar 2022 at 09:58, Rob Cliffe via Python-ideas
wrote:
>
> Without testing, I am sure it would be slower.
That's a trap to be careful of. Test! :)
ChrisA
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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
On Wed, 2 Mar 2022 at 09:24, Steven D'Aprano wrote:
>
> On Tue, Mar 01, 2022 at 04:04:31PM +, Rob Cliffe via Python-ideas 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
On Tue, Mar 01, 2022 at 04:04:31PM +, Rob Cliffe via Python-ideas 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
Along similar lines, you could also use the fact that Python does
lazy-evaluation to make a do-while which forward-references variables:
```
enter_dw = True
while enter_dw or (condition_with_vars_not_defined_the_first_time_through):
enter_dw = False
define_those_vars()
```
Sketch of a
If you don't like:
while True:
...
if whatever:
break
One thing I've seen people do is:
condition = True
while condition:
...
condition = whatever
You can use it if you really hate `while True` loops with `break`.
___
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
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
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. :)
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