@abc.abstractmethod
    def report_free(self):
        pass
Coerce a string value to an int port number, and checks the validity.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/compute/resources/base.py/Resource.report_free--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/python/usage.py/portCoerce