[Zope-CMF] taL: test evaluates all arguments

[Ivo van der Wijk]

On Fri, Jan 03, 2003 at 09:59:17PM +0100, robert rottermann wrote:
> if have the following tal statement:
> 
> tal:define="resp_def  python:here.users_with_local_role('ObjectResponsible');
>          responsible python:test(resp_def == [], '', resp_def[0]);"
> 
> When resp_def is an empty list I get an index out of range error.
> This seems very strange.
> 
> can anybody give me a hint what goes wrong here ??
> 

test() is just a procedure invocation, and all arguments are evaluated before
the procedure is invoked. 

Try resp_def[:1] in stead, i.e.

 tal:define="resp_def  python:here.users_with_local_role('ObjectResponsible');
          responsible python:resp_def[:1];"

(or even reduce it to a single line)

Cheers

	Ivo

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