The expression string is not Python, it is a little mini language.
You do not need an “if”. It is syntactical incorrect (check your console for output).
The expression results in an Boolean value as is. In your case either “cor_exhibit_door == stol_exhibit_door” alternative: “cor_exhibit_door = stol_exhibit_door”
AND/OR can be lower case and
True, False can be true false.
When the expression evaluates to True all connected actuators will be activated, otherwise deactivated.
The controller evaluates each time the controller gets triggered (check the level triggering flags at your sensors).