python exception

import  Calculator;   cal1 = Calculator.Calculator();   print(cal1.Add(3, 2));

 

class Calculator:     def  __init__(self):         self.result = 0;       def Add(self, number1, number2):         result = 0;         try:             #Error Create             #raise();               if(type(number1) != int or type(number2) != int):                raise();             else:                 result = number1 + number2;           except Exception as e:             return  -1;           return  result;       def Sub(self, number1, number2):         return number1 - number2;