> Thank you, Chris. Class.__bases__ is exactly what I wanted to see. > And I thought I had tried isinstance(), and found it lacking -- but I > just tried it again, and it does what I hoped it would do.
While isinstance is no doubt the proper way to access this information, you may have run into problems because that isinstance and ducktyping do not always work well together... because having a particular interface does not mean you inherited that interface. Checking __bases__ will not solve the problem either though, so best to use isinstance if you can and document what you do well enough to help people avoid breaking the assumptions of your system. not that you didn't know that... but I thought it was worth saying because I, at least, more and more do meta-class style techniques which unfortunately do not play well with certain methods of checking type. -cba -- http://mail.python.org/mailman/listinfo/python-list
