"expecting string, unicode or buffer object" on executemany

Hello everybody,
I have a strange error:

When I call:
cursor.executemany( self.__sql, self.__buffer )

where
self.__sql is an insert statement (unicode) and self.__buffer is a list of tuple,  the execution throws an exception with  the following message:
“expecting string, unicode or buffer object”

But if I substitute the executemany with a cycle:

for item in   self.__buffer:
                cursor.execute(self.__sql, item)

the script works without any problems.

Can anyone help me?
Thanks in advance.

Riccardo
______________________

Riccardo Oliosi
SIDFramework
Gruppo CAD IT
Tel. +39.045.82.11.111
Fax +39.045.82.11.110
[email protected]<mailto:[email protected]>
www.cadit.it<http://www.cadit.it/>

CAD IT S.p.A.
Sede legale: Via Torricelli, 44/A - 37136 Verona
C.S. € 4.669.600,00 i.v.
C.F./P.IVA e n. iscr. R.I. di VR 01992770238
R.E.A. di VR n. 210441
______________________

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