def Execute(self, opt, args):
    raise NotImplementedError
main loop waiting for keyboard interrupt i.e. do nothing until user press 'X' or CTRL-C
dataset/ETHPy150Open ossxp-com/repo/command.py/Command.Execute--crossover with--dataset/ETHPy150Open ericgibert/supersid/supersid/textsidviewer.py/textSidViewer.run