Update app.py

app.py

@@ -42,9 +42,9 @@ def math(number1:int, number2:int, operator: str) -> str:
         operator: 'ADD' or 'SUBTRACT'
     """
 
-    if operator = 'ADD':
+    if operator == 'ADD':
         return f"{number1} + {number2} = {number1 + number2}"
-    elif operator = 'SUBTRACT':
+    elif operator == 'SUBTRACT':
         return f"{number1} - {number2} = {number1 - number2}"
     else
         return f"The operator {operator} is not valid, use either ADD or SUBTRACT"