Help understanding the decisions *behind* python?

[Luis Alberto Zarrabeitia Gomez]

Quoting Inky 788 <inky788 at gmail.com>:

> > The good reason is the immutability, which lets you use
> > a tuple as a dict key.  
> 
> Thanks for the reply Hendrik (and Steven (other reply)). Perhaps I'm
> just not sophisticated enough, but I've never wanted to use a list/
> tuple as a dict key. This sounds like obscure usage, and a bit
> contrived as a reason for having *both* lists and tuples.

I don't seem to understand your definition of obscure and contrived. It seems
that you got late to this thread, and you missed the examples. I'd suggest you
to go back on this thread and look at them. 


heights = {}
heights[1,2] = 5
heights[1,3] = 7
heights[3,5] = 1

addresses[lastname, firstname] = my_home_address

census[location, age] = census.get((location, age), 0) + 1

All those are using tuples as dict keys.

Regards,

-- 
Luis Zarrabeitia
Facultad de Matemática y Computación, UH
http://profesores.matcom.uh.cu/~kyrie


-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu