Python help

if operator != ("add"|"sub"):
    print ("Invalid Operator")

Basically I want to check if operator has anything other than "add" or "sub" assigned to it, but python 2.6 is saying

TypeError: unsupported operand type(s) for |: 'str' and 'str'

How should I check if operator is anything other than add or sub?

Im looking for a print function, it cant be printufu (thats japanese for printf) or any stdio function. It has to be of 2 or more parameteru (thats japanese for 2 parameters) and has be be chibi (small) sized. And has to be really kawaii (cute). Also It has to be about 10-20 bux. And you have to post documentation of it first (i want to make shure it's kawaii [cute]). And it would be nice if it came with matching input reading (WITH error handling). OH! and it CANNOT have any complicated syntax, or be made out of C. It has to be made of C++, or something like that. Also it would be nice if it was made in japan. and not in china or corea (korea) or whatever. I have found a function similar to the one im describing in sourceforge, but it was 1 parameteru, and i dont want my formatou (formatting) to touch my other things (it can get mixed up and i would not like that, plus 2 paraneters looks more kawaii)