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devel / comp.lang.python / Re: Configuring an object via a dictionary

SubjectAuthor
o Re: Configuring an object via a dictionaryPeter J. Holzer

1
Re: Configuring an object via a dictionary

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From: hjp-python@hjp.at (Peter J. Holzer)
Newsgroups: comp.lang.python
Subject: Re: Configuring an object via a dictionary
Date: Sun, 17 Mar 2024 16:11:53 +0100
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 by: Peter J. Holzer - Sun, 17 Mar 2024 15:11 UTC
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On 2024-03-17 17:15:32 +1300, dn via Python-list wrote:
> On 17/03/24 12:06, Peter J. Holzer via Python-list wrote:
> > On 2024-03-16 08:15:19 +0000, Barry via Python-list wrote:
> > > > On 15 Mar 2024, at 19:51, Thomas Passin via Python-list <python-list@python.org> wrote:
> > > > I've always like writing using the "or" form and have never gotten bit
> > >
> > > I, on the other hand, had to fix a production problem that using “or” introducted.
> > > I avoid this idiom because it fails on falsy values.
> >
> > Perl has a // operator (pronounced "err"), which works like || (or),
> > except that it tests whether the left side is defined (not None in
> > Python terms) instead of truthy. This still isn't bulletproof but I've
> > found it very handy.
>
>
> So, if starting from:
>
> def method( self, name=None, ):
>
> rather than:
>
> self.name = name if name else default_value
>
> ie
>
> self.name = name if name is True else default_value

These two lines don't have the same meaning (for the reason you outlined
below). The second line is also not very useful.

> the more precise:
>
> self.name = name if name is not None or default_value
>
> or:
>
> self.name = default_value if name is None or name

Those are syntax errors. I think you meant to write "else" instead of
"or".

Yes, exactly. That's the semantic of Perl's // operator.

JavaScript has a ?? operator with similar semantics (slightly
complicated by the fact that JavaScript has two "nullish" values).

hp

--
_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | hjp@hjp.at | -- Charles Stross, "Creative writing
__/ | http://www.hjp.at/ | challenge!"

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