gmane.comp.python.tutor

headers Tiago Katcipis | 17 May 20:16

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Tiago Katcipis wrote:
> Im writing a class on python and i want to implement the == and != 
> operators on it. I have read about __cmp__ and about __eq__ for == and 
> __ne__ for ! =. My question is... who is the better to use? and if 
> there is no better what are the advantages and disvantages of them. 
> Some articles talk about using cmp, and others about the eq...its a 
> little confusing 

AFAIK either approach is OK. No advantages. (Other than writing one 
method vs 2).

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Bob Gailer
919-636-4239 Chapel Hill, NC

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On Sat, May 17, 2008 at 2:18 PM, Tiago Katcipis <katcipis <at> inf.ufsc.br> wrote:
> Im writing a class on python and i want to implement the == and != operators
> on it. I have read about __cmp__ and about __eq__ for == and __ne__ for ! =.
> My question is... who is the better to use?

Use __cmp__() if it meets your needs - you just have to define one
method and you get all comparisons. The other special methods - "rich
comparisons" - were introduced in Python 2.1 to allow additional
flexibility when __cmp__() is not adequate.
http://www.amk.ca/python/2.1/index.html#SECTION000500000000000000000

Kent
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Best way to define comparison

Re: Best way to define comparison

Re: Best way to define comparison