视频分析：

http://v.youku.com/v_show/id_XMTMyODkyNDA0MA==.html?from=y1.7-1.2

class Solution(object):

    def isHappy(self, n):

        if n==1:

            return True

        elif n==4:

            return False

        else:

            return self.isHappy(self.Happy(n))

    def Happy(self,n):

        z=0

        while n!=0:

            d=n%10

            z+=pow(d,2)

            n=(n-n%10)//10

        return z

    def HappySeq(self,start,cnt):

        tmp=start

        print (tmp,end=' ')

        for x in range(1, cnt):

            tmp=self.Happy(tmp)

            print (tmp,end=' ')

            if tmp==4 or tmp==1:

                break