try edit in the run mode

app.py

@@ -1,7 +1,8 @@
 import gradio as gr
 
-def greet(name):
-    return "Hello " + name + "!!"
+def greet(check_val):
+    check_val = str(check_val.upper())
+    return check_val
 
 demo = gr.Interface(fn=greet, inputs="text", outputs="text")
 demo.launch()