It looks like I just confused myself, in my test case I got "None" 
returned and I thought it was a model definition issue but it was me 
leaving one of the columns used for the computed column at None.

So if I do just the following the read only column (FB SQL computed 
column) are working for me.

class Quality(Base):
    __table__ = sa.Table(u'quality', metadata,
...
    sa.Column(u'comboname', sa.String(length=63, convert_unicode=False), 
server_default=""),
...
    )

    # read only columns
    comboname = sao.column_property(__table__.c.comboname)


Werner

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