how to overload operator "< <" (a < x < b)?

Steven D'Aprano steve at REMOVE-THIS-cybersource.com.au
Sat Aug 8 05:31:46 CEST 2009


On Fri, 07 Aug 2009 08:04:22 -0700, Scott David Daniels wrote:

> Benjamin Kaplan wrote:
>> .... Python does not support compound comparisons like that. You have
>> to do "a > b and b > c".
> 
> Funny, my python does.  This has been around a long time. I am not
> certain whether 1.5.2 did it, but "chained comparisons" have been around
> for a long time.

Yes it does:

$ python1.5
Python 1.5.2 (#1, Apr  1 2009, 22:55:54)  [GCC 4.1.2 20070925 (Red Hat 
4.1.2-27)] on linux2
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>>
>>> 2 < 3 < 4
1


Remembering that back then, 0 and 1 were used instead of False and True.


-- 
Steven



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