import gc
class Foo:
pass
x = Foo()
print('No dict in', gc.get_referents(x))
x.__dict__
print("Now there's a dict:", gc.get_referents(x))
aW1wb3J0IGdjCgpjbGFzcyBGb286CiAgICBwYXNzCgp4ID0gRm9vKCkKcHJpbnQoJ05vIGRpY3QgaW4nLCBnYy5nZXRfcmVmZXJlbnRzKHgpKQp4Ll9fZGljdF9fCnByaW50KCJOb3cgdGhlcmUncyBhIGRpY3Q6IiwgZ2MuZ2V0X3JlZmVyZW50cyh4KSk=