def get_default_value ( self ):
        dv  = self.default_value
        dvt = self.default_value_type
        if dvt < 0:
            if not isinstance( dv, _InstanceArgs ):
                return super( BaseInstance, self ).get_default_value()

            self.default_value_type = dvt = 7
            self.default_value      = dv  = ( self.create_default_value,
                                              dv.args, dv.kw )

        return ( dvt, dv )
Returns a tuple of the form: ( default_value_type, default_value )
dataset/ETHPy150Open enthought/traits/traits/trait_types.py/BaseInstance.get_default_value