overriding bool() for custom class

Is this Python 2.x or Python 3.x? For Python 2.x you are looking to override __nonzero__ instead.

class test:
    def __nonzero__(self):
        return False

If you want to keep your code forward compatible with python3 you could do something like this

class test:
    def __bool__(self):
        return False
    __nonzero__=__bool__