bool behavior in Python 3000?

Bruno Desthuilliers bruno.42.desthuilliers at wtf.websiteburo.oops.com
Fri Jul 13 12:35:58 CEST 2007


Miles a écrit :
> On Jul 12, 8:37 pm, Alan Isaac <ais... at american.edu> wrote:
>> I do not like that bool(False-True) is True.
> 
> I've never seen the "A-B" used to represent "A and not B", nor have I
> seen any other operator used for that purpose in boolean algebra,
> though my experience is limited.  Where have you seen it used?

I've personnaly seen the usual arithmatic operators used for boolean 
algebra in quite a lot of papers covering the topic - but I've always 
had to translate them to more common boolean ops to understand these 
papers.

> What's wrong with 'and', 'or', and 'not'?  I think that redefining *,
> +, and - to return booleans would only encourage programmers to use
> them as shortcuts for standard boolean operations--I'd hate to see
> code like this:
>>>> if user.registered * (user.age > 13) - user.banned: ...
> 

OMG ! Lord have mercy ! St Guido, save us !

> I don't mind that arithmatic operations are _possible_ with bools, but
> I would strongly prefer to see the boolean keywords used for
> operations on booleans.

+10



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