x = "error"

def test(x):
    class Test(object):
        x = x
    print ("x:", x)
    print ("Test.x:", Test.x)
    
    class Test2(object):
        y = x
    print ("Test2.y:", Test2.y)
    
    class Test3(object):
        y = x
        x = x
    print ("Test3.x:", Test3.x)
    print ("Test3.y:", Test3.y)
    
    class Test4(object):
        pass
    Test4.x = x
    print ("Test4.x:", Test4.x)
    
test("success")
from dis import dis
dis(test)