[Python-ideas] list.sort with a int or str key
Guido van Rossum
guido at python.org
Thu Sep 16 17:44:15 CEST 2010
On Thu, Sep 16, 2010 at 8:35 AM, Daniel Stutzbach
<daniel at stutzbachenterprises.com> wrote:
> list.sort, sorted, and similar methods currently have a "key" argument that
> accepts a callable. Often, that leads to code looking like this:
> mylist.sort(key=lambda x: x)
> myotherlist.sort(key=lambda x: x.length)
> I would like to propose that the "key" parameter be generalized to accept
> str and int types, so the above code could be rewritten as follows:
> I find the latter to be much more readable.
-1. I think this is too cryptic.
> As a bonus, performance for those cases would also improve.
Have you measured this? Remember that the key function is only called
N times while the number of comparisons (using the values returned
from the key function) is O(N log N).
--Guido van Rossum (python.org/~guido)
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