<__main__.MyClass object at 0x104646850>.attr: 0 -> 0
16: self.attr = 0

<__main__.MyClass object at 0x104646850>.attr: 0 -> 1
19: setattr(self, "attr", 1)

<__main__.MyClass object at 0x104646850>.attr: 1 -> 3
27: self.attr = randint(0, 10)

