Can signal handlers memory leak in PyQt?

Short question:

Can signal handlers memory leak.

Long question:

In C#, if I attach a handler to an event

left_object.left_event += right_object.right_handler

Then I need to remove the handler when I get rid of right_object or the garbage collector will never dispose of it (since left_object.left_event retains a pointer to right_object)

Is the same also true of PyQt signals and slots.

left_object.left_signal.connect( right_object.right_handler )

I see from this question that Qt automatically delinks signals and slots, when the destructor of either left_object or right_object is called, but in Python I cannot explicitly call the destructor, and right_handler is a plain-old-function.

Do I need to remove the handler to prevent right_objects memory-leaking, or does PyQt use some sort of weak-referencing?

from Can signal handlers memory leak in PyQt?