[Zope-Checkins] Re: [Checkins] SVN: Products.Five/trunk/ Now you can use the old registry with the new API for registerig components.

[Florent Guillaume]

On 27 Jul 2006, at 16:15, Lennart Regebro wrote:
> Modified: Products.Five/trunk/site/localsite.py
> ===================================================================
> --- Products.Five/trunk/site/localsite.py	2006-07-27 13:51:25 UTC  
> (rev 69270)
> +++ Products.Five/trunk/site/localsite.py	2006-07-27 14:15:46 UTC  
> (rev 69271)
> @@ -16,12 +16,26 @@
>  $Id$
>  """
>
> +from operator import xor
> +def one_of_three(a, b, c):
> +    # Logical table for a three part test where only one can be true:
> +    # 0 0 0: 0
> +    # 0 0 1: 1
> +    # 0 1 0: 1
> +    # 0 1 1: 0
> +    # 1 0 0: 1
> +    # 1 0 1: 0
> +    # 1 1 0: 0
> +    # 1 1 1: 0
> +    return xor(xor(a, b), c) and not (a and b and c)

Heh, boolean algebra is nice but sometimes integers convey the  
meaning much better:
   return int(a)+int(b)+int(c) == 1

Florent

-- 
Florent Guillaume, Nuxeo (Paris, France)   Director of R&D
+33 1 40 33 71 59   http://nuxeo.com   fg at nuxeo.com