(self, curr_node)
| 155 | return False |
| 156 | |
| 157 | def preShow(self, curr_node): |
| 158 | if curr_node is not None: |
| 159 | self.preShow(curr_node.left) |
| 160 | print(curr_node.label, end=" ") |
| 161 | self.preShow(curr_node.right) |
| 162 | |
| 163 | def preorder(self, curr_node): |
| 164 | if curr_node is not None: |