Return a dictionary of variables with `type` :class:`CFNType`.

        Returns:
            dict: variables that need to be submitted as CloudFormation
                Parameters. Will be a dictionary of <parameter name>:
                <parameter value>.

def get_parameter_values(self):
        """Return a dictionary of variables with `type` :class:`CFNType`.

        Returns:
            dict: variables that need to be submitted as CloudFormation
                Parameters. Will be a dictionary of <parameter name>:
                <parameter value>.

        """
        variables = self.get_variables()
        output = {}
        for key, value in variables.items():
            try:
                output[key] = value.to_parameter_value()
            except AttributeError:
                continue

        return output