Update app.py

app.py

@@ -2,13 +2,13 @@ import gradio as gr
 
 def calculator(text1, operation, text2):
     if operation == "add":
-        return num1 + num2
+        return text1 + text2
     elif operation == "subtract":
-        return num1 - num2
+        return text1 - text2
     elif operation == "multiply":
-        return num1 * num2
+        return text1 * text2
     elif operation == "divide":
-        return num1 / num2
+        return text1 / text2
 
 demo = gr.Interface(
     calculator,