sorry,
        i missed the xplanaition.
i think this'll explain...
<div tal:define= penalty   
python:context.getPenalty(group_code=gcode,item_code=icode);
 penaltylen python:test(len(penalty)==0)>

so not:penaltylen ensures that unit_cost is present for this row.

anyway i think this worked finally :
 <td>
  <span tal:condition="not:penaltylen">
  <span tal:define="unit_cost python:penalty[0].unit_cost;
    global sum python:sum+unit_cost" tal:content="unit_cost"/>
 </span>

<td><b tal:content="sum"></b></td></tr>

thanks deepak

On 5/24/05, Deepak <[EMAIL PROTECTED]> wrote:
> 
> What r those "penaltylen" and "penalty"? and also can u tell us y u r 
> checking  "not:penaltylen"?
> 
> regards,
> Deepak
> 
> prabuddha ray wrote:
> 
> > ok this is again freaky on my part.
> >
> >my problem still remains intact .as i've told earlier,
> >in my ZPT I needed to find a way to sum up column values 
> >if they are present and print the total at the last row.
> >
> >I tried this as a Deepak pal tipped :
> >
> ><span tal:condition="not:penaltylen"
> tal:content="python:penalty[0].unit_cost"/>
> >        <span tal:define="global sum python:sum+penalty[0].unit_cost"/>
> > <tr><td>Total <td><b tal:content="sum"></b></td></tr>
> >
> > but what happens is obvious , for reports where even one row has the
> >unitcost missing followiing error comes up:
> >
> >"tuple indx out of range"
> >
> >when i changed tghe span tgs alike this :
> >
> ><span tal:condition="not:penaltylen"
> tal:content="python:penalty[0].unit_cost">
> >        <span tal:define="global sum python:sum+penalty[0].unit_cost"/>
> ></span>
> >
> >no error was there but the total remained 0.
> >
> >No ZSQLmethod can be used to get the sum coz its pretty complex.
> >
> > so plz rethink the code I'm also trying hard.
> > hope for a reply soon
> > 
> >  
> >
> >>On 5/20/05, Deepak <[EMAIL PROTECTED]> wrote:
> >>    
> >>
> >>>Hi Prabuddha,
> >>>   
> >>>check this ...
> >>>
> >>><span tal:define="global sum python:0"/>
> >>><span tal:repeat="item python:here.somesql()">
> >>>    <span tal:condition="item/var" tal:define="global sum 
> >>>python:sum+item.var"/>
> >>></span>
> >>><span tal:content="sum"/>        
> >>>
> >>>thanks,
> >>>
> >>>Deepak
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