It is possible...

 <div tal:define="ignored python:request.set('sumVar', 0)">

but not recommended.  The kind of logic you are trying to wedge into the
template should be pushed out into a Python script, leaving the template
only with the job of rendering the results.


Tres.
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I want show tabular data with money and the last show the sum
can you explain me how can made better this then? almost never use python script :P

Thanks