Python Linked Queue

def _swap(self, l, r): """ ------------------------------------------------------- Swaps two nodes within a deque. l has taken the place of r, r has taken the place of l and _front and _rear are updated as appropriate. Data is not moved. Use: self._swap(self, l, r): ------------------------------------------------------- Parameters: l - a pointer to a deque node (_Deque_Node) r - a pointer to a deque node (_Deque_Node) Returns: None ------------------------------------------------------- """