Update app.py

app.py

@@ -71,14 +71,15 @@ with gr.Blocks() as demo:
                 go_btn = gr.Button("Go", variant="primary")
                 clear_btn = gr.Button("Clear", variant="secondary")
 
-                def go(*_args):
+                def go(*args):
                     time.sleep(3)
-                    return "https://gradio-static-files.s3.us-west-2.amazonaws.com/header-image.jpg"
+                    return "https://gradio-static-files.s3.us-west-2.amazonaws.com/header-image.jpgjpg"
 
                 go_btn.click(go, [radio, drop, drop_2, check, name], img, api_name="go")
 
                 def clear():
                     time.sleep(0.2)
+                    return None
 
                 clear_btn.click(clear, None, img)
 
@@ -117,13 +118,24 @@ with gr.Blocks() as demo:
 
     with gr.Row():
         with gr.Column(scale=2):
-            chatbot = gr.Chatbot([("Hello", "Hi")], label="Chatbot")
+            chatbot = gr.Chatbot(
+                value=[
+                    {"role": "user", "content": "Hello"},
+                    {"role": "assistant", "content": "Hi"}
+                ],
+                label="Chatbot"
+            )
             chat_btn = gr.Button("Add messages")
 
+            def chat(history):
+                time.sleep(2)
+                return history + [
+                    {"role": "user", "content": "How are you?"},
+                    {"role": "assistant", "content": "I am good."}
+                ]
+
             chat_btn.click(
-                lambda history: history
-                + [["How are you?", "I am good."]]
-                + (time.sleep(2) or []),
+                chat,
                 chatbot,
                 chatbot,
             )