Decorator

def rangetest(*argchecks):                  # validate positional arg ranges
    def onDecorator(func):
        def onCall(*args):
            print('argchecks : '+str(argchecks))
            for (ix, low, high) in argchecks:
                print('ix : '+str(ix))
                if args[ix] < low or args[ix] > high:
                    errmsg = 'Argument %s not in %s..%s' % (ix, low, high)
                    raise TypeError(errmsg)
            return func(*args)
        return onCall
    return onDecorator

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
    @rangetest([1, 0.0, 1.0])             # giveRaise = rangetest(..)(giveRaise)
    def giveRaise(self, percent):
        self.pay = int(self.pay * (1 + percent))

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

sue.pay

sue.giveRaise(0.10)

sue.pay