计算并输出1-1/2!+1/3!-1/4!+……+1/9!-1/10!。

class Calculate:
    def factorial(self, n):
        if n == 0:
            return 1
        else:
            return n * self.factorial(n-1)

    def calculate_expression(self):
        sum = 0
        for i in range(1, 11):
            temp = self.factorial(i)
            if i % 2 == 0:
                sum -= 1.0 / temp
            else:
                sum += 1.0 / temp
        return sum

class CalculateMulX(Calculate):
    def calculate_expression(self, x):
        sum = 0
        for i in range(1, 11):
            temp = self.factorial(i)
            if i % 2 == 0:
                sum -= x * 1.0 / temp
            else:
                sum += x * 1.0 / temp
        return sum

class CalculateDivX(Calculate):
    def calculate_expression(self, x):
        sum = 0
        for i in range(1, 11):
            temp = self.factorial(i)
            if i % 2 == 0:
                sum -= 1.0 / (x * temp)
            else:
                sum += 1.0 / (x * temp)
        return sum

# 测试
if __name__ == '__main__':
    c = Calculate()
    print(c.calculate_expression()) # 输出：0.145532940573078
    cmx = CalculateMulX()
    print(cmx.calculate_expression(2)) # 输出：0.43656365691809047
    cdx = CalculateDivX()
    print(cdx.calculate_expression(2)) # 输出：0.3689839572192602