def fval ( self , instance ) : try : val = instance . __dict__ [ self . instance_field_name ] except KeyError as e : #raise AttributeError(str(e)) val = None return val
instance attribute not recognized python
return the raw value that this property is holding internally for instance
def fval(self, instance):
        """return the raw value that this property is holding internally for instance"""
        try:
            val = instance.__dict__[self.instance_field_name]
        except KeyError as e:
            #raise AttributeError(str(e))
            val = None

        return val