Update app.py

app.py

@@ -1,16 +1,16 @@
 import gradio as gr
 
-val = gr.State(None)
-def respond(newVal):
-    global val
-    if(val is None):
-        val = newVal
-    return val
+def respond(newVal, previous_val):
+    if previous_val is None:
+        previous_val = newVal
+    return previous_val
 
-demo = gr.Interface(fn=respond,
-                    inputs = [gr.Textbox()],
-                    outputs= [gr.Textbox()],
-                    title = 'testVar')
-demo.launch()
+with gr.Blocks() as demo:
+    val = gr.State(None)
+    input_text = gr.Textbox(label="Input")
+    output_text = gr.Textbox(label="Output")
 
-    
+    input_text.change(respond, [input_text, val], val)
+    val.change(lambda val: val, val, output_text)
+
+demo.launch()