Update app.py

app.py

@@ -1,30 +1,25 @@
-# chat_app.py
 import os
 import gradio as gr
 import google.generativeai as genai
 
-# 1️⃣  Configure the SDK – read the key from an env-var
+# --- Gemini -------------------------------------------------------
 genai.configure(api_key=os.getenv("GEMINI_API_KEY"))
+model = genai.GenerativeModel("gemini-2.0-flash")
+chat  = model.start_chat()                     # keeps its own history
 
-# 2️⃣  Create a model and a stateful chat session
-model = genai.GenerativeModel("gemini-2.0-flash")          # change model name if you like
-chat  = model.start_chat()                           # history handled for you
-
-# 3️⃣  Callback that Gradio calls each turn
 def respond(message, history):
-    reply = chat.send_message(message)               # send the new user turn
-    return reply.text                                # only the assistant reply
+    return chat.send_message(message).text     # the reply only
 
-# 4️⃣  Build the UI
+# --- Gradio -------------------------------------------------------
 iface = gr.ChatInterface(
-    fn=respond,
-    title="Gemini Chatbot",
-    chatbot=gr.Chatbot(height=600),
-    textbox=gr.Textbox(placeholder="Ask anything…"),
-    retry_btn="🔄 Retry",
-    clear_btn="🗑️ Clear",
+    fn          = respond,
+    title       = "Gemini Chatbot",
+    description = "Ask anything – powered by Google Gemini",
+    chatbot     = gr.Chatbot(height=600, type="messages"),  # <- new type
+    textbox     = gr.Textbox(placeholder="Type a message…"),
+    retry_btn   = "🔄 Retry",   # works on Gradio >= 4.19
+    clear_btn   = "🗑️ Clear",
 )
 
-# 5️⃣  Launch the app
 if __name__ == "__main__":
     iface.launch()