Update app.py

app.py

@@ -1,7 +1,16 @@
 import gradio as gr
+from pytube import YouTube
 
-def greet(name):
-    return "Hello " + name + "!!"
+with demo:
+    gr.Markdown(
+        """
+    # Flip Text!
+    Start typing below to see the output.
+    """
+    )
+    input = gr.Textbox(placeholder="Flip this text")
+    output = gr.Textbox()
 
-iface = gr.Interface(fn=greet, inputs="text", outputs="text")
-iface.launch()
+    input.change(fn=flip_text, inputs=input, outputs=output)
+
+demo.launch()