[Python-ideas] Dart-like method cascading operator in Python

[Nick Coghlan]

On 22 Nov 2013 05:11, "Masklinn" <masklinn at masklinn.net> wrote:
>
> On 2013-11-21, at 18:26 , Andrew Barnert <abarnert at yahoo.com> wrote:
> > Is it really that hard to name a plot "p"? Is typing “p.", or reading
it, more work than ".."?
>
> What’s the point of anything then?
>
>     p = gnuplot.newPlot()
>     p.set(‘xrange [0:5]’)
>     p.set(‘xrange [0:20]’)
>     n = p.newPlot()
>     n.addSeries(“Linear”, [1, 2, 3])
>     n.addSeries(“Quadratic”, [1, 4, 6])
>     p.run()
>
> is terser and adds no more pressure to the local namespace, the only
> loss is the pseudo-nested formatting and that’s not really a core goal
> of cascading.

If a statement local namespace is the goal, then see PEPs 403 and 3150.

Given the problems with those, this far more limited suggestion has even
less chance of approval.

Cheers,
Nick.

>
> > So if this is any part of the argument for the proposal, I'm -1.
>
> As far as there’s any interest to cascading it’s that it’s terser
> than sequencing calls with explicit receivers, and that it’s an
> expression allowing inline initialisation sequences and not requiring
> creating a binding.
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