def selfAndInitDemo():
    persionInstance = Person("crifan");
    persionInstance.sayYourName();
    personInstance2 = Person("michael")
    personInstance2.sayYourName()
    personInstance2.changeGlobalName("newName")
    personInstance2.sayYourName()
    print "whole global name is %s"%(name); # -> whole global name
    child = Child('child')
    child.say()