def __init__(self, name, on_next=None, on_error=None, on_completed=None):
on_error = on_error or self._error_handler
Node.__init__(self, name)
Observer.__init__(self,
on_next=on_next,
on_error=on_error,
on_completed=on_completed)
def __init__(self, name, config=None):
Node.__init__(self, name, config)
Observable.__init__(self, self.on_subscribe)
Observer.__init__(self, self.on_command, self._error_handle)
