def _get_argv(index, default=None):
    ''' get the argv input argument defined by index. Return the default
        attribute if that argument does not exist
    '''
    return _sys.argv[index] if len(_sys.argv) > index else default
def _get_argv ( index , default = None ) : return _sys . argv [ index ] if len ( _sys . argv ) > index else default
get the argv input argument defined by index. Return the default
        attribute if that argument does not exist