comment

PegasusWang · PegasusWang · commit d8d6633a3808 · 2018-12-18T22:27:05.000+08:00
diff --git a/docs/14_树与二叉树/btree.py b/docs/14_树与二叉树/btree.py
@@ -73,7 +73,7 @@ def preorder_trav_use_stack(self, subtree):
             s.push(subtree)
             while not s.empty():
                 peek = s.pop()
-                print(peek.data)
+                print(peek.data)    # 注意这里我用了 print，你可以用 yield 产出值然后在调用的地方转成 list
                 if subtree.left:
                     s.push(subtree.left)
                 if subtree.right:
