Using Template in script (python)

Hi list,
I'm trying to use the make a  string using a Template and fill it with the
result of a query, but gime this error
You are not allowed to access 'safe_substitute' in this context

Zope = 2.12

from string import Template
rst=someSQL()[0]
txt=Template("""
<span id="datos_vehiculo"
   data-placa="${placa}"
   data-serie="${serie}"
   data-marca="${marca}"
   data-submarca="${submarca}"
   data-modelo="${modelo}">
</span>
""")
newtxt=txt.safe_substitute(rst)

do exist some way to do it?
-- 
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es saber que nos queda un dia menos de vida

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