Design of Computer Programs

https://www.udacity.com/course/viewer#!/c-cs212/l-48688918/e-48723568/m-

• 计算一组数的总和

  • bad function
    def ss(nums):
    total = 0
    for i in range(len(nums)):

    total = (total + nums[i]**2)
    

    return total

  • good function
    def ss(nows):
    return sum(x**2 for x in nums)