The python doc says super can be called with the following args.

1. super(type, obj) -> bound super object; requires isinstance(obj, type)
2. super(type, type2) -> bound super object; requires issubclass(type2, type)

So the second argument in super has to be either a class to satisfy (1) or a metaclass to satisfy (2)

This code runs eventhough self is neither a class nor a metaclass. So is this a mistake in the doc or am I making a mistake somewhere?