Create app.py

app.py

@@ -0,0 +1,13 @@
+import gradio as gr
+
+def say_hello():
+    return "Hello, world!"
+
+demo = gr.Interface(
+    fn=say_hello,
+    inputs=None,
+    outputs="text",
+    title="Hello World Gradio App"
+)
+
+demo.launch()