Here is my python function:
 def get_lines(self, payslip,cr,uid, context=None):
	ret = []
        obj = self.pool.get('hr.employee')
        obj_ids = obj.search(cr, uid, [])
        res = obj.read(cr, uid, obj_ids, ['id'], context)
	for r in res :
		if r['name_related'] != 'Administrator' :
			line_data = dict()
			line_data['name']= r['name_related']
			print r['name_related']
			ret.append(line_data)
    	return ret
And in my mako:
%for obj in objects: 
<% lines = obj.get_lines(payslip) %>
%for line in lines:
 <tr style='height:20.65pt'>
  <td width=31.9 style='width:31.9pt;border:none;border-bottom:solid windowtext 1.0pt;
  background:#FCE4D6;padding:0cm 3.5pt 0cm 3.5pt;height:14.65pt'>
  <p class=MsoNormal align=center style='margin-bottom:0cm;margin-bottom:.0001pt;
  text-align:center;line-height:normal'><b><span style='font-size:8.0pt;
  font-family:"Arial","sans-serif";color:black'>Nom Employé</span></b></p>
  </td>
  <td width=31.9 style='width:31.9pt;border:none;border-bottom:solid windowtext 1.0pt;
  background:#FCE4D6;padding:0cm 3.5pt 0cm 3.5pt;height:14.65pt'>
  <p class=MsoNormal align=center style='margin-bottom:0cm;margin-bottom:.0001pt;
  text-align:center;line-height:normal'><b><span style='font-size:8.0pt;
  font-family:"Arial","sans-serif";color:black'> ${line}</span></b></p>
  </td>
 </tr>
%endfor
%endfor
And i get this:
AttributeError: 'Undefined' object has no attribute 'get_lines'