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Message: [QUOTE="Bror Johansson, post: 1872177"] Hi, I have a class-hierarchy (fairly deep and fairly wide). Is there a good and general way to test an instance-object obj for having a class belonging to a certain "sub-tree" of the hierarchy with a common parent class C? Testing for presence of attributes created at __init__ time is not considered general. Testing presence in the set of (manually enumerated) classes belonging to the "subtree" is not considered general. Testing like this: if C in [obj.__class__] + list_of_superclasses_to(obj.__class__): ... is general but I'm looking for a better way, if there is one. /BJ [/QUOTE]