class Poly:
    def __init__(self, list):
        if Poly.validate_input(list):
            self.list = list
        else:
            raise Exception("Invalid input")

    @staticmethod
    def validate_input(args):
        """Check if the argument is a nonempty list of numbers"""
        if args and isinstance(args, list) and all([isinstance(arg, int) or isinstance(arg, float) for arg in args]):
            return True
        else:
            return False

    def order(self):
        """Return the order of the polynomial."""
        if self.list != [0]:
            return len(self.list) - 1
        else:
            raise Exception("Zero polynomial.")