How to use the parameterized.parameterized.param.from_decorator function in parameterized

def check_input_values(cls, input_values):
        # Explicitly convery non-list inputs to a list so that:
        # 1. A helpful exception will be raised if they aren't iterable, and
        # 2. Generators are unwrapped exactly once (otherwise `nosetests
        #    --processes=n` has issues; see:
        #    https://github.com/wolever/nose-parameterized/pull/31)
        if not isinstance(input_values, list):
            input_values = list(input_values)
        return [ param.from_decorator(p) for p in input_values ]