Vererbung Python3

import time

from threading import Thread, Event, Lock

class myClass(Thread, Event):

    __waiting=Lock()  

    _activeDevices = 0

    def __init__(self, name=None, function=None, setUp=None, setDown=None):

        Thread.__init__(self)    

....

File "meineKlasse.py", line 5, in <module>

 class myClass(Thread, Event):

TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases