class Calculator(object):

    @staticmethod
    def addition(a, b):
        return a + b

    @staticmethod
    def substraction(a, b):
        return a - b

    @staticmethod
    def division(a, b):
        return a / b

class Calculator(object):

    @staticmethod
    def addition(a, b):
        return a + b

    @staticmethod
    def substraction(a, b):
        return a - b

    @staticmethod
    def division(a, b):
        return float(a) / float(b)

Fix division