Update app.py

app.py

@@ -1,9 +1,10 @@
 import gradio as gr
 
-def test(x):
-    return 
+def test():
+    return "Hello"
 
 with gr.Blocks() as demo:
-    pass
+    t = gr.Textbox()
+    demo.launch(test, None, t)
 
 demo.launch()