code: def get_parameter_values(self):
          
          variables = self.get_variables()
          output = {}
          for key, value in variables.items():
              try:
                  output[key] = value.to_parameter_value()
              except AttributeError:
                  continue
  
          return output
docs: 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>.