How do I catch the error message if the user gives wrong input (without using isinstance)?

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error-handling

Python3.6

I wrote a code to catch my error message using try and except (I want to write it without using isinstance) and I am getting the error message when the input is not an integer. The problem is, the program is giving me error message even if the input is valid integer. Please give me some suggestions to make it run. My code is given below:

class Hotel:
    def __init__(self,room,catagory):
        if room != int:
            raise TypeError ()
        self.room = room
        self.catagory = catagory
        self.catagories = {"A":"Elite","B":"Economy","C":"Regular"}
        self.rooms = ["0","1","2","3","4","5"]

    def getRoom(self):
        return self.room

    def getCatagory(self):
        return self.catagory
        return self.catagories.get(self.catagory)
    def __str__(self):
        return "%s and %s"%(self.rooms[self.room],self.catagories.get(self.catagory))
try:
    room1 = Hotel(a,"A")
    room2 = Hotel(1,"A")
except:
    print("there's an error")

I appreciate your help.

What I have tried:

I tried to use the exception clause before but that did not work.