def __str__(self):
        
        return self.to_xls()
``DockerBuildScript.build_command`` is ``omnibus_package_builder`` by
dataset/ETHPy150Open taoliu/taolib/Assoc/tables.py/Table.__str__--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/admin/test/test_packaging.py/DockerBuildScriptTests.test_build_command