class Test:
    def __init__(self, arg_1, arg_2):
        self.arg_1 = arg_1
        self.arg_2 = arg_2

    def sum(self):
        return self.arg_1 + self.arg_2

test = Test(1,2)
test.arg_1 # =1
test_arg_2 # =2

test.sum # =3