Update app.py

app.py

@@ -1,7 +1,19 @@
 import gradio as gr
 
-def calculator(num1,symbol,num2):
-    
+def calculator(num1, symbol, num2):
+    if symbol == "add":
+        return num1 + num2
+    elif symbol == "subtract":
+        return num1 - num2
+    elif symbol == "multiply":
+        return num1 * num2
+    elif symbol == "divide":
+        if num2 == 0:
+            raise gr.Error("Cannot divide by Zero!")
+        return num1 / num2
+
+
+calc = gr.Block()