Michael Dudzik wrote: > On Wed, 01 Feb 2006 09:07:17 +0100, "Andreas Jung" [..] >>>in Zope2 there's a test() method that can be used in TAL (*). Is there >>>something comparable in Zope3? >>> >>>I know how to write such a method but how to make it available in the >>>namespace of TALES-"python:"-expressions? I would like to write >>>expressions like this: >>> >>><div tal:attributes="class python: 'foo' + test(condition == True,' >>>bar','')" /> >>> >>You can write this in Python as >> >> condition and true_expression or false_expression > > > That doesn't work under some conditions: > > C and A or B where C is a boolean > > if C is false it evaluates to B > if C is true it evaluates to A EXCEPT when bool(A) == false > > example: > > C and None or 7 ALWAYS evaluates to 7
Just make it 'not C and 7 or None' :) Igor _______________________________________________ Zope3-users mailing list [email protected] http://mail.zope.org/mailman/listinfo/zope3-users
