Parameter passing with freetds/MSSQL2000

Hello

What is the current status regarding parameter passing with
freetds/MSSQL2000? I get an error if I try simple queries.

import Sybase as dbapi

con=dbapi.connect('cazalla','gotta','password','personal')
cur=con.cursor()
cur.execute('select * from usuarios where cd_usuario=@u',  
{'@u':'marcos'})
pprint.pprint(cur.fetchall())

This is what I get (line numbers are incorrect)

Traceback (most recent call last):
  File "etcPythonSybase.py", line 191, in ?
    cur.execute('select * from usuarios where
cd_usuario=@u',{'@u':'marcos'})
  File "/usr/lib/python2.2/site-packages/Sybase.py", line 379, in
execute
    self._raise_error(Error, 'ct_param')
  File "/usr/lib/python2.2/site-packages/Sybase.py", line 309, in
_raise_error
    raise exc(text)
Sybase.Error: ct_param
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