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devel / comp.lang.python / Re: New assignmens ...

SubjectAuthor
* Re: New assignmens ...Chris Angelico
`* Re: New assignmens ...Paul Rubin
 `- Re: New assignmens ...Jon Ribbens

1
Re: New assignmens ...

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From: ros...@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: New assignmens ...
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 by: Chris Angelico - Wed, 27 Oct 2021 18:42 UTC

On Thu, Oct 28, 2021 at 4:34 AM Christman, Roger Graydon <dvl@psu.edu> wrote:
> Do you put special code in next_couple() to recognize that the provided arguments
> are actually the first couple so it can return those unmodified, but then require its
> own mental note not to give you an infinite loop forever returning that first couple?
>
> Do you have to define a special case such as (a,b) = (0,0) or (None,None) to tell
> next_couple that you really want the first one? That seems a little counter-intuitive
> to have something named "next" need a special input to mean "first",

In some cases, there is a very real special startup value (a seed).
For instance, if we're calculating something relating to the
Mandelbrot set:

# The point we're working with
c = (0.25 + 0.125j)
# Always start here
z = (0 + 0j) # or just 0
while abs(z := z*z+c) < 2:
...

Though in this case, you don't look for a next_couple, you look for a
single next value, and the other value is constant.

But it all depends on the exact process being done, which is why I've
been asking for real examples.

ChrisA

Re: New assignmens ...

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From: no.em...@nospam.invalid (Paul Rubin)
Newsgroups: comp.lang.python
Subject: Re: New assignmens ...
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 by: Paul Rubin - Thu, 28 Oct 2021 01:44 UTC

Chris Angelico <rosuav@gmail.com> writes:
> But it all depends on the exact process being done, which is why I've
> been asking for real examples.

My most frequent use case for walrus is so common that I have sometimes
implemented a special class for it:

if g := re.search(pat1, text):
hack(g.group(1))
elif g := re.search(pat2, text):
smack(g.group(2), "foo")
...

It's way messier if you have to separate the assignment and test the old
way. That said, I'm still on Python 3.7 so I haven't yet gotten to use
walrus or the new match statement (or is it expression).

I do feel surprised that you can't use an arbitrary lvalue (to use C
terminology) on the lhs of a walrus. That seems downright weird to me.
But, I haven't studied the PEP so I don't know if there was a particular
rationale.

Re: New assignmens ...

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From: jon+use...@unequivocal.eu (Jon Ribbens)
Newsgroups: comp.lang.python
Subject: Re: New assignmens ...
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 by: Jon Ribbens - Thu, 28 Oct 2021 09:53 UTC

On 2021-10-28, Paul Rubin <no.email@nospam.invalid> wrote:
> Chris Angelico <rosuav@gmail.com> writes:
>> But it all depends on the exact process being done, which is why I've
>> been asking for real examples.
>
> My most frequent use case for walrus is so common that I have sometimes
> implemented a special class for it:
>
> if g := re.search(pat1, text):
> hack(g.group(1))
> elif g := re.search(pat2, text):
> smack(g.group(2), "foo")
> ...
>
> It's way messier if you have to separate the assignment and test the old
> way. That said, I'm still on Python 3.7 so I haven't yet gotten to use
> walrus or the new match statement (or is it expression).
>
> I do feel surprised that you can't use an arbitrary lvalue (to use C
> terminology) on the lhs of a walrus. That seems downright weird to me.
> But, I haven't studied the PEP so I don't know if there was a particular
> rationale.

Well, that's what I was saying: there's no rationale - the limitation
is not even mentioned, let alone explained.

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