[Python-ideas] Adding list.pluck() (original) (raw)

Alexandre Zani alexandre.zani at gmail.com
Sat Jun 2 00:53:48 CEST 2012

I must confess that I don't find "pluck" a very intuitive name for this functionality. For me it was evocative of what pop currently does. That's an N of 1 so maybe I'm just wrong on that one.

More importantly, this would make the use of a list method dependent upon the type of the contained items. (works for dicts and nothing else) That would be unprecedented for list methods and potentially confusing. What would be the behavior if the list contains non-dicts?

On Fri, Jun 1, 2012 at 2:48 PM, Cenk Altı <cenkalti at gmail.com> wrote:

l.pluck('name') is more readable IMO.

On Sat, Jun 2, 2012 at 12:25 AM, Alexandre Zani <alexandre.zani at gmail.com> wrote: What if it's a list of objects instead of a list of dicts? List comprehension already makes this easy:

[i['name'] for i in l] I don't think this would add as much in python as it adds in javascript. On Fri, Jun 1, 2012 at 2:16 PM, Oleg Broytman <phd at phdru.name> wrote: On Sat, Jun 02, 2012 at 12:10:03AM +0300, Cenk Alt?? <cenkalti at gmail.com> wrote: pluck() is a beautiful function which is in underscore.js library. Described as "A convenient version of what is perhaps the most common use-case for map: extracting a list of property values."

http://documentcloud.github.com/underscore/#pluck What about it implementing for python lists? And maybe for other iterables? Like operator.attrgetter? http://docs.python.org/library/operator.html#operator.attrgetter Oleg. -- Oleg Broytman            http://phdru.name/            phd at phdru.name Programmers don't die, they just GOSUB without RETURN.

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