Calling a method with SAFEARRAY parameter

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I have to call a method of a COM Object which is defined as
GetTableInfo ([in] BSTR bstrTableName,[in, out]
SAFEARRAY(BSTR)*bstrColumnTitles,[in, out] SAFEARRAY(long)*lColumnPos)

I tried with
            columnTitles = VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_BSTR,
[None])
            columnPos = VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_I4,
[None])
            object.GetTableInfo("TABLENAME", columnTitles, columnPos)
and with
            columnTitles = VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_BSTR,
[""])
            columnPos = VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_I4, [0])
            object.GetTableInfo("TABLENAME", columnTitles, columnPos)

but I get an error:
Object ot type VARIANT has no len()

What I am doing wrong ?

Thanks in advance.

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<div dir=3D"ltr"><div class=3D"gmail-contents">
<p>
</p>I have to call a method of a COM Object which is defined as</div><div c=
lass=3D"gmail-contents">GetTableInfo ([in] BSTR bstrTableName,[in, out] SAF=
EARRAY(BSTR)*bstrColumnTitles,[in, out] SAFEARRAY(long)*lColumnPos)</div><d=
iv class=3D"gmail-contents"><br></div><div class=3D"gmail-contents">I tried=
 with</div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 columnTitles =3D VARIA=
NT(pythoncom.VT_ARRAY | pythoncom.VT_BSTR, [None])<br>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 columnPos =3D VARIANT(pythoncom.VT_ARRAY | pythoncom.V=
T_I4, [None])<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 object.GetTableI=
nfo(&quot;TABLENAME&quot;, columnTitles, columnPos)<div>and with</div><div>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 columnTitles =3D VARIANT(pythonco=
m.VT_ARRAY | pythoncom.VT_BSTR, [&quot;&quot;])<br>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 columnPos =3D VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_I=
4, [0])<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 object.GetTableInfo(&q=
uot;TABLENAME&quot;, columnTitles, columnPos)</div><div><br></div><div>but =
I get an error:=C2=A0</div><div>Object ot type=C2=A0VARIANT has no len()</d=
iv><div><br></div><div>What I am doing wrong ?</div><div><br></div><div>Tha=
nks in advance.</div><div><br></div></div>

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