Sergey B Kirpichev added the comment:

On Wed, Apr 29, 2015 at 06:51:21PM +0000, Paul Moore wrote:
> But that's a sort without a key.

Why it does matter?  It have quick exit.  For same reasons - Python could...

> In Perl you do a key sort via:

That's just your implementation.  But we could add here a
quick exit as well.

> The fact of the matter is that what Python does is documented behaviour

No.  Unless you absolutely sure - all readers think that "sorting
process" starts even for trivial lists.  No reasons to believe in that
nonsense - as you could see from sorting implementations in other languages.

> benefit (small) isn't worth the cost of making a change (which would
> only be in Python 3.5 and later anyway

It's easy for users (i.e. me) to backport this feature (i.e. make wrapper for
sorted()).  Benefit is small, I admit, but why not remove unnecessary
restrictions from the language?  I hope, I did my best to explain why.

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<http://bugs.python.org/issue24075>
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