def last_option(self):
        if not self.sequence:
            return None
        return self.last()
Unit test of ListInstance() with filter string.
dataset/ETHPy150Open EntilZha/PyFunctional/functional/pipeline.py/Sequence.last_option--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/Solutions-Using-ETL-tool-on-Google-Compute-Engine/gce_api_test.py/GceApiTest.testListInstance_Filter