【Kata Daily 190920】Square(n) Sum（平方加总）

题目：

Complete the square sum function so that it squares each number passed into it and then sums the results together.

For example, for [1, 2, 2] it should return 9 because 1^2 + 2^2 + 2^2 = 9.

解题方法：（再想想可能就出来了）

def square_sum(numbers):
    return sum(map(lambda x: x**2,numbers))

还有其他的办法：

def square_sum(numbers):
    return sum(x**2 for x in numbers)