How can I create main inside class?

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Python3.6

I am trying to learn using main function inside a class but as I am not sure how to use it so my code is not giving any output. As far as i learned I need to define def main under the __init__ method to write name == main, but the problem is I do not know how to write the "def getRoom" and other function inside that main function. Can i get some suggestion how can I write the correct program?

My code is given below:

class Hotel:
    def __init__(self,room,catagory):
        
        if type(catagory) != str:
            raise TypeError()
        if room<0 or room >5:
            raise ValueError()
        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.catagories.get(self.catagory)
    def __str__(self):
        return "%s and %s"%(self.rooms[self.room],self.catagories.get(self.catagory))
if (__name__== "__ main__"):
    r = Hotel ()
    print (r)
    try:
        room1 = Hotel(2,1)
        print (room1)
    except TypeError: 
        print("Error")
    try:
        room2= Hotel(1,"A")
        print (room2)
    except ValueError:
        print ("mistake")

What I have tried:

I have tried to create " def main()" but that did not work with my "def getRoom" and
"def getCatagory"