Variable as qualifier

Hello,
I'm trying to put together some cgi's (written in python) for reporting purpose.
But i have some problem trying to pass a variable as argument in a method call 
to the XML-RPC
server.

Example:

#!/usr/bin/python

import xmlrpclib
import cgi

fields = cgi.FieldStorage()
LastName = fields["lastname"].value

server = xmlrpclib.Server('http://localhost:22000/RPC2',
login='<user>', password='<passwd>')

result = server.person.fetch(
{
'qualifier' : "name like '%s'" $ LastName,
'sortOrderings' : ["name",],
}
)

....

I tried different solutions without success, it seems that the Python 
interpreter didn't recognize
the variable placeholder.
How can i pass a variable as qualifier in a XML-RPC method call?

Thanks

Daniele Dal Re
dando@xxxxxxxx



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