Multiple "cmp"s chained one after another

[Volker Grabsch]

vincent wehren wrote:
> 
> If you don't care about the year, why not just "normalize" the year
> to all be the same using the replace method of the date instance?

That's a very bad idea. In my example, this would work, but in "reality"
I don't sort datetime objects, of course! (Is there any real application
where you want to do that?)

Instead, I'm sorting "Person" objects using a "birthday" attribute.
Since I use these Person objects also in other places, they should never
be modified without just to be sorted. In general, the number side effects
should always be minimized.

> datesNorm = [obj.replace(year=1900) for obj in (dates)]
> datesNorm.sort()

This code would go bad especially in my situation, where my "Person"
objects are SQLObjects, thus the "normalisation" would be written into
the database. Okay, one could use transactions and rollback", but I
think, my point is clear now.

Nevertheless, I think you idea is very interesting. Is there any "real"
application where normalizing just for sorting would be reasonable?


Greets,

-- 
Volker Grabsch
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