Hw04 题解 (UCB CS61A@2021 Fall)
Mobiles
Q2: Weights
Implement the
planetdata abstraction by completing theplanetconstructor and thesizeselector so that a planet is represented using a two-element list where the first element is the string'planet'and the second element is its size.
从问题的描述中我们可以知道什么是 planet. 就是一个长度为 2 的 list, 内容是 ['planet', size]. 可以参考 mobile 函数, 这两个函数的代码是很类似的