add #8 python implement

notes/面试总结.md

@@ -532,7 +532,24 @@ public TreeLinkNode GetNext(TreeLinkNode pNode) {
 ```
 
 ```python
-
+def GetNext(self, pNode):
+        # write code here
+        # pNode is None
+        if not pNode:
+            return pNode
+        if pNode.right:
+            node = pNode.right
+            while node.left:
+                node = node.left
+            return node
+        else:
+            while pNode.next:
+                parent = pNode.next
+                if parent.left == pNode:
+                    return parent
+                pNode = pNode.next
+        # pNode not have the next node
+        return None
 ```