solved if : synthax error

app.py

@@ -27,13 +27,13 @@ def calculus(arg1:char, arg2:double, arg3: double)-> double:
         arg2: the first number
         arg3: the second number
     """
-    if arg1=='+'
+    if arg1=='+':
         return arg2+arg3
-    else if arg1=='-'
+    else if arg1=='-':
         return arg2-arg3
-    else if arg1=='*'
+    else if arg1=='*':
         return arg2*arg3
-    else if arg1=='/'
+    else if arg1=='/':
         return arg2/arg3
     
     return "The character in arg1 wasn't a valid mathematical operation!"