It's interesting to see the Python internals for the condition synchronization mechanism. The internal class _Condition creates an RLock() object if no existing lock has been passed to the class's constructor. Also, the lock will be managed when acquire() and released() are called:

class _Condition(_Verbose):
    def __init__(self, lock=None, verbose=None):
        _Verbose.__init__(self, verbose)
        if lock is None:
            lock = RLock()
        self.__lock = lock