Python 列表[1,2,3,4,5],请使用map()函数输出[1,4,9,16,25]

l = [1, 2, 3, 4, 5]
def foo(i):
    return i*i

n = map(foo, l)
print(list(n))

打印结果为 

[1, 4, 9, 16, 25]