# example of not looking in the middle scope

a = 5

def func():
    b = 6

    def nested1():
        
        print '  a has value: ', a
        print '  b has value: ', b

    def nested2():

        a = 55
        b = 66

        print '    a has value: ', a
        print '    b has value: ', b

    def nested3():

        try:
            print '    a has value: ', a
        except:
            print '    a is undefined'

        try:
            print '    b has value: ', b
        except:
            print '    b is undefined'

        a = 555
        b = 666

        print '    a has value: ', a
        print '    b has value: ', b

    def nested4():

        global a
        global b

        print '    a has value: ', a

        try:
            print '    b has value: ', b
        except:
            print '    b is undefined'
            

    nested1()
    nested2()
    nested3()
    nested4()

func()