(self, val)
| 13 | self.tail.prev = self.head |
| 14 | |
| 15 | def append(self, val) -> Node: |
| 16 | node = Node(val) |
| 17 | node.next = self.tail |
| 18 | node.prev = self.tail.prev |
| 19 | self.tail.prev = node |
| 20 | node.prev.next = node |
| 21 | return node |
| 22 | |
| 23 | @staticmethod |
| 24 | def remove(node) -> Node: |