add tree examples

app.py

@@ -110,7 +110,41 @@ real_docstring = r"""
         :raises DuplicateDocumentError: Exception trigger on duplicate document
         :return: None
 """
-    
+
+tree_code = r"""
+class Tree:
+    def __init__(self):
+        self.val = None
+        self.left = None
+        self.right = None    
+"""
+
+insert_code = r"""
+def insert(self, val):
+    if self.val:
+        if val < self.val:
+            if self.left is None:
+                self.left = Tree(val)
+            else:
+                self.left.insert(val)
+        elif val > self.val:
+            if self.right is None:
+                self.right = Tree(val)
+            else:
+                self.right.insert(val)
+    else:
+        self.val = val
+"""
+
+display_code = r"""
+def printValues(self):
+    if self.left:
+        self.left.printValues()
+    print(self.val)
+    if self.right:
+        self.right.printValues()
+"""
+                        
 def docgen_func(function_code):
     req_data = {"inputs": function_code}
     output = query(req_data)
@@ -147,7 +181,7 @@ _A model is given the task to generate natural language comments for a programmi
 For further details, see the [CodeXGLUE](https://github.com/microsoft/CodeXGLUE) benchmark dataset and open challenge for code intelligence. 
 """,
     theme='grass',
-    # examples=[[dfs_code],['code 2']],
+    examples=[[tree_code],[insert_code],[display_code]],
     verbose=True,
     # show_tips=True
 )