python 3クラスの演算子の再ロード

#    
#        

class Try_str(str):
    def __add__(self, other):
        return int(self) + int(other)

    def __sub__(self, other):
        return int(self) - int(other)
    '''
                   
    def __mul__(self, other):    

    def __truediv__(self, other):   ， /

    def __floordiv__(self, other):   ， //

    def __mod__(self, other):     ， %

    def __divmod__(self, other):     divmod（）      ， ，   

    def __pow__(self, power, modulo=None):     power（）    **      

    def __lshift__(self, other):     

    def __rshift__(self, other):  

    def __and__(self, other):    

    def __xor__(self, other):     

    def __or__(self, other):    
    '''

if __name__ == '__main__':
    a = Try_str('123')
    b = Try_str('12')
    print(a+b)
    print(a-b)