def default(self, line):
            os.system(line)
            return 0
Function to encapsulate next_ext_unit attribute
dataset/ETHPy150Open cloudaice/simple-data/misc/virtenv/share/doc/pycurl/examples/linksys.py/LinksysInterpreter.default--crossover with--dataset/ETHPy150Open modflowpy/flopy/flopy/mbase.py/BaseModel.next_ext_unit