Re: how to convert code that uses cmp to python3

From	Random832 <random832@fastmail.com>
Newsgroups	comp.lang.python
Subject	Re: how to convert code that uses cmp to python3
Date	2016-04-08 10:29 -0400
Message-ID	<mailman.90.1460125759.2253.python-list@python.org> (permalink)
References	(4 earlier) <57075F43.7060004@rece.vub.ac.be> <85fuuw5ypl.fsf@benfinney.id.au> <5707B2CE.1010407@rece.vub.ac.be> <CAPTjJmrMv5O5vwrbfHJJCdiHi87naPOanhPmk4Ba_SLRgu1m4Q@mail.gmail.com> <1460125750.1451220.572931817.3E46D651@webmail.messagingengine.com>

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On Fri, Apr 8, 2016, at 10:08, Chris Angelico wrote:
> seq1 == seq2
> seq1 < seq2
> 
> You only need ONE comparison, and the other is presumed to be its
> opposite. When, in the Python 3 version, would you need to compare
> twice?

== might be just as expensive as the others, particularly if the
sequences are unlikely to share object identity. I suspect he chose "s1
< s2; s2 < s1" precisely because someone suggested in another post on
this thread to exclusively use the less-than operator on purity grounds.

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Re: how to convert code that uses cmp to python3 Random832 <random832@fastmail.com> - 2016-04-08 10:29 -0400

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