Florent Guillaume wrote:
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
Hey, this is fun! How about this:
def only_one(*args):
return sum(bool(i) for i in args) == 1
--
Benji York
Senior Software Engineer
Zope Corporation
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