1

  就直接上我的代码吧，主要是对max函数与lambda函数的学习。
  其中max函数的说明[1]
  是一个最大值函数，返回输入数据（可迭代的，如列表字典等等）的最大值，同时可以通过key属性（输入为函数），输出需要的数据最大值
  lambda函数的说明[2]
  是一种轻量级的函数定义方法，刚好可以巧妙地用在max函数中key属性的定义

2

第一种

if __name__ == "__main__":
    shape1 = [128, 15, 50]
    shape2 = [512, 30, 40]
    shape3 = [1024, 20, 30]
    shapes = [shape1, shape2, shape3]
    k = max(shapes)
    print(k)
>>[1024, 20, 30]

第二种，加入key属性。使用lambda函数，定义为list的第二个数字

if __name__ == "__main__":
    shape1 = [128, 15, 50]
    shape2 = [512, 30, 40]
    shape3 = [1024, 20, 30]
    shapes = [shape1, shape2, shape3]
    k = max(shapes,key = lambda x:x[1])
    print(k)
>>[512, 30, 40]

第三种，加入key属性。使用lambda函数，定义为list的第三个数字

if __name__ == "__main__":
    shape1 = [128, 15, 50]
    shape2 = [512, 30, 40]
    shape3 = [1024, 20, 30]
    shapes = [shape1, shape2, shape3]
    k = max(shapes,key = lambda x:x[2])
    print(k)
>>[128, 15, 50]

Refrences

[1] https://www.runoob.com/python/func-number-max.html
[2] https://www.runoob.com/python/python-functions.html