[ZPT] dictionaries, has_key, and the test function

[Troy Farrell]

did you try
   <span tal:define="parents python:(results.has_key('parents') and 
results['parents']) or None">
     do stuff
   </span>

or something like that?

Troy

Tim Lynch wrote:
> I'd like to write something like:
> 
> <span tal:define="parents python:test(results.has_key('parents'), results['parents'], None)">
>   do stuff
> </span>
> 
> 
> This fails if 'parents' doesn't exist; the line faults & I get
> a key doesn't exist error.
> 
> 
> 
> I've worked out an alternative:
> 
> <span tal:condition="python:test(results.has_key('parents'), 1, 0)">
>    <span tal:define="parents python:results['parents']">
>        do stuff
>    </span>
> </span>
> 
> 
> but I figure I'm missing something here and that first approach
> ought to somehow work.
> 
> Anybody have any ideas?
> 
> 
> I'm running 2.60b1 if it makes any difference.
> 
> 
> ---
> 
> tlynch@nal.usda.gov
> 
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