python 3.5 raiaing an error when import the class Manager in this module sayning name Manager is not define

[lunkambamuk at gmail.com]

class Person:
    def __init__(self, name, job=None, pay=0):
        self.name = name
        self.job = job
        self.pay = pay
    def lastName(self):
        return self.name.split()[-1]
    def giveRaise(self, percent):
        self.pay = int(self.pay * (1 + percent))
    def __repr__(self):
        return '[Person: %s, %s]' % (self.name, self.pay)
class Manager(Person):
    def giveraise(self, percent, bonus=.10):
        Person.giveRaise(self, percent + bonus)

if __name__ == '__main__':
    #self-test code
    bob = Person('Bob Smith')
    sue = Person('Sue Jones', job='dev', pay=100000)
    print(bob)
    print(sue)
    print(bob.lastName(), sue.lastName())
    sue.giveRaise(.10)
    print(sue.pay)
    tom = Manager('Tom Jones', 'mgr', 50000)
    tom.giveRaise(.10)
    print(tom.lastName())
    print(tom)