Python Single and Multilevel inheritance

class Emp:
    def __init__(s, sal, name, eid):
        s.sal = sal
        s.name = name
        s.eid = eid

    def aaa(s):
        print("Name ",s.name)
        print("Sal ",s.sal)
        print("Eid ",s.eid)


class Prog(Emp):
    def __init__(s, cod, time ,sal, name, eid):
        Emp.__init__(s, sal, name, eid)
        s.cod = cod
        s.time = time

    def printDetail2(s):
        Emp.aaa(s)
        print("Cod ",s.cod)
        print("Time ",s.time)

class Tester(Prog):
    def __init__(s, tester, ttest, cod, time ,sal, name, eid):
        Prog.__init__(s, cod, time, sal, name, eid)
        s.tester = tester
        s.ttest = ttest

    def printDetail2(s):
        Emp.aaa(s)
        print("tester ",s.tester)
        print("TTest ",s.ttest)


a  = Tester("no", 89, "true", 67, 12,"aSas", 4)
a.printDetail2()