I tried to subclass threading.Condition earlier today but it didn't work out. Here is the output of the Python interpreter when I try to subclass the threading.Condition class:
>>> import threading
>>> class ThisWontWork(threading.Condition):
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Error when calling the metaclass bases
function() argument 1 must be code, not str
You're getting that exception because, despite its class-like name,
threading.Condition is a function, and you cannot subclass functions.
>>> type(threading.Condition) <type 'function'>
This not-very-helpful error message has been raised on the Python bugtracker, but it has been marked "won't fix."