isinstance - Python

class isInstance:
    def control(self, param):
        if isinstance(param, list):
            result = ["{} is valid number.".format(i) if i % 2 == 0 else None for i in param]
            print(list(filter(None,result)))
        else:
            print('Undefined variable type: {}'.format(gType))

obj = isInstance()
obj.control([5,16,983,35,3,12,24])