employee.py

class Employee():
    def __init__(self,first,last,ssn,sal):
        self.first = first
        self.last = last
        self.ssn = ssn
        self.sal = sal
    def __str__(self):
        outstring = '{0}, {1} - ${2} - {3}'.format(self.last,self.first,self.sal,self.ssn)
        return outstring
    def giveRaise(self,percentRaise):
        self.sal += int(self.sal * (percentRaise / 100))

manager.py

class Manager(Employee):
    def __init__(self,first,last,ssn,sal,title,bonus):
        self.title = title
        self.bonus = bonus
        self.first = first
        self.last = last
        self.ssn = ssn
        self.sal = sal
    def __str__(self):
        outstring = '{0}, {1} - {4} - ${2}/{5} - {3}'.format(self.last,self.first,self.sal,self.ssn,self.title,self.bonus)
        return outstring

testruns.py

from employee import Employee
from manager import Manager

employees = []
employees.append(Employee("Miller","Steven",111111111,30000))
employees.append(Employee("Carlson","Mark",222222222,40000))
employees.append(Employee("Smith","John",333333333,50000))
employees.append(Manager("Jordan", "Ambrose", 444444444, 60000, "Assistant Manager", 20000))
employees.append(Manager("Menkveld", "Bob", 555555555, 70000, "General Manager", 30000))

for emp in employees:
    print(emp)
    emp.giveRaise(10)
    print(emp)