def __get__(self, instance, owner):
try:<EOL><INDENT>return instance._values[self.column.column_name].getval()<EOL><DEDENT>except AttributeError as e:<EOL><INDENT>return self.query_evaluator<EOL><DEDENT>
Returns either the value or column, depending
on if an instance is provided or not

:param instance: the model instance
:type instance: Model