Select Objects by type

I’ve got a list of Rhino.DocObjects

how can I extract only curves and points of this list?

I tried in Python with

if rs.IsPoint(obj) or rs.IsCurve(obj) or rs.IsPolyline(obj):
    objetretour.append(obj)

it return "Message: unable to convert 8106539c-7807-4598-9970-5a7ac165b7e9 into Curve geometry

" when obj is a Brep…

thank’s

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