On Wed, 01 Feb 2006 09:07:17 +0100, "Andreas Jung"
<[EMAIL PROTECTED]> said:
> --On 1. Februar 2006 09:04:36 +0100 Frank Burkhardt <[EMAIL PROTECTED]> wrote:
> > Hi,
> > 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
C and None or 7 ALWAYS evaluates to 7
However, the expression (B,A)[C] always works if C is a boolean
I'm using that until Python 2.5 comes along.
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