Can someone explain me the Borg design pattern in python?

I know this pattern is used in order to create multiple instances with the same state, but i really don't understand how it works.

class Borg:
    _shared_state = {}

    def __init__(self):
    self.__dict__ = self._shared_state



class Singleton(Borg):

    def __init__(self, **kwargs):
        Borg.__init__(self)
        self._shared_state.update(kwargs)

    def __str__(self):
        return str(self._shared_state)

More specifically, what happens when in the Singleton init method I call Borg.init ?