This method expects a scalar string or a list of input_fields
        to

def set_renamed_input_fields(self, renamed_input_fields):
        """This method expects a scalar string or a list of input_fields
        to """
        if not (isinstance(renamed_input_fields, basestring) or
                isinstance(renamed_input_fields, ListType)):
            raise ValueError("renamed_input_fields must be a string or a list")
        self.renamed_input_fields = renamed_input_fields
        return self