Given that we have comprehensions that use s simple expression, and
operator.itemgetter for common keys, the use cases for these simple lambdas
are pretty rare these days.
Sure, some folks seem to prefer map and filter as a matter of style, but I
don’t think we need to create cryptic notation to make that easier,
NOTE: I expect many of the examples you found in the stdlib predate
comprehensions and itemgetter.
-CHB
On Wed, Sep 29, 2021 at 8:09 AM Steven D'Aprano <st...@pearwood.info> wrote:
> On Wed, Sep 29, 2021 at 09:11:35AM -0000, Dominik Vilsmeier wrote:
>
> > * `sorted(items, key=?['key'])`
> > * `filter(? > 0, items)`
> > * `map(f'{?:.3f}', items)`
>
> I think those are massively more cryptic and hard to read than an
> explicit lambda. Being too terse is worse that being too verbose:
> consider how few people use APL compared to how many use Java.
>
> "lambda" is admittedly an odd name for a concept, most familiar to
> computer science theorists, but at least it is pronouncable in English.
> We can read it and talk about it:
>
> "Pass a lambda as the key parameter."
>
> Whereas here how do we pronounce "?"? "Pass a question mark as the key
> parameter" sounds like *all you need do* is pass the literal ? symbol.
> In practice people are going to call it lambda, in which case you might
> as well just write lambda.
>
> And please take mercy on the poor beginners who have to Google for
> "Python ?" to try to work out what on earth this does. At least other
> punctuation marks are either well known from school maths or other
> languages.
>
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--
Christopher Barker, PhD (Chris)
Python Language Consulting
- Teaching
- Scientific Software Development
- Desktop GUI and Web Development
- wxPython, numpy, scipy, Cython
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