According to http://docs.python.org/library/threading.html#condition-objects, threading.Condition is a class. However, in fact it turns out to be function that constructs a _Condition instance.

I don't know the reason for that, but it seems to me that either Condition should be a class, or the reason for it being a function should be documented so that people who I would like to inherit from Conditionknow if that is not supported, or if they can safely inherit from _Condition instead.