New assignmens ...
jon+usenet at unequivocal.eu
Thu Oct 28 05:53:53 EDT 2021
On 2021-10-28, Paul Rubin <no.email at nospam.invalid> wrote:
> Chris Angelico <rosuav at 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):
> 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
Well, that's what I was saying: there's no rationale - the limitation
is not even mentioned, let alone explained.
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