Create app.py

app.py

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+import os
+import gradio as gr
+from google import genai
+
+# --- Load Gemini API key from Hugging Face secret ---
+GEMINI_API_KEY = os.environ.get("GEMINI_API_KEY")
+if not GEMINI_API_KEY:
+    raise ValueError("❌ GEMINI_API_KEY not found in environment. Add it in Hugging Face Secrets.")
+
+# --- Configure Gemini client ---
+genai.configure(api_key=GEMINI_API_KEY)
+client = genai.Client()
+
+# Create a persistent chat session
+chat = client.chats.create(model="gemini-2.5-flash")
+
+# --- Define chatbot function ---
+def chat_with_gemini(user_input, history):
+    try:
+        response = chat.send_message(user_input)
+        history.append((user_input, response.text))
+        return history, history
+    except Exception as e:
+        return history + [(user_input, f"⚠️ Error: {str(e)}")], history
+
+# --- Gradio UI ---
+with gr.Blocks(title="Gemini 2.5 Flash Chatbot") as demo:
+    gr.Markdown("# 🤖 Gemini 2.5 Flash Chatbot\nAsk me anything!")
+    chatbot = gr.Chatbot()
+    message = gr.Textbox(placeholder="Type your message and press Enter")
+    clear = gr.Button("Clear Chat")
+    state = gr.State([])
+
+    message.submit(chat_with_gemini, inputs=[message, state], outputs=[chatbot, state])
+    clear.click(lambda: ([], []), None, [chatbot, state])
+
+# --- Launch app ---
+if __name__ == "__main__":
+    demo.launch()