I work with ArcGIS Desktop (latest version). I have a feature class called "space" that should be labeled. The label should look like this [room number] + "/ n" + [person] (python). But my problem is not that every room is assigned to a person like a toilet or laboratory. If there is a room that no one owns, the room should only be labled with the room number, but this is not the case. There is no label.

How I tried to do it :

def FindLabel ( [room_number],[person] ):
  if [person] ="<Null>":
    return  [person] + '\n' +[Raum_Nummer]
    return [Raum_Nummer]

"< Null >" is my default value

1 Answer 1


You can use either if [person] is not "" or if [person] != "" and they should work. Also, under the if/else statements, it should be [room_number] not [Raum_Nummer], or at least you need to unify the variables either [room_number] or [Raum_Nummer]. Do not forget to to check advance labeling to enable carriage return.

Try the following:

def FindLabel ([room_number],[person]):
    if [person] is not "":
        return  [person] + '\n' + [room_number]
        return [room_number]
  • I tried it but ther is an erro : Carriage returns are not allowed in simple expressions Commented Apr 10, 2020 at 11:13
  • 1
    You need check advance labeling to enable carriage return.
    – ahmadhanb
    Commented Apr 10, 2020 at 11:29

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