这是一篇关于LeetCode第202题‘快乐数’的解决方案，主要介绍如何使用Python来判断一个数是否为快乐数。快乐数是指经过将数字的各个位数平方和重复计算，直到得到1或者进入一个不包含1的循环。文章提供了一个具体的Python解法。
Write an algorithm to determine if a number is “happy”.
A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.
Example:
Input: 19
Output: true
Explanation:
12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1
这道题目明显是数学题
Python解法如下：
class Solution:
def isHappy
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