Is types.InstanceType no longer valid with Python 2.2

[Jason Orendorff]

> You see the problem?! With old-type classes the comparision succeeds,
> with new-type classes it fails.
> The type of the instance will show the whole class-structure, but
> that's not of any interest (as mentioned in posting to Emile).
> Okay, one way would be to compare the type of the object with all
> other types in 'types' (except InstanceType). If all fail, the object
> must be an instance of a class. Not very satisfying, is it.

  isinstance(x, object)    # true for all new-style instances

  issubclass(type(x), object)    # ditto

## Jason Orendorff    http://www.jorendorff.com/