def METHOD_NAME(self, extension="pkl"):
    if self.output_file_path is not None and self.output_file_path != "":
        return "{}.{}".format(self.output_file_path, extension)
    export_path_name = ".".join(self.input_file_path.split(".")[:-1])
    return "{}__filtered.{}".format(export_path_name, extension)