class Person:  
    """
    revisit the Person class to validate argument
    """
    def __init__(self, name, job, pay):
        self.job  = job
        self.pay  = pay
                                          # arg 0 is the self instance here
                                          # giveRaise = rangetest(..)(giveRaise)
    def giveRaise(self, percent):
        self.pay = int(self.pay * (1 + percent))

sue = Person('Sue Jones', 'dev', 100000)

sue

<__main__.Person at 0x10421e828>

sue.pay

100000