202_Happy_Number_v1.py

class Solution(object):
    def isHappy(self, n):
        """
        :type n: int
        :rtype: bool
        
        Be careful, this is NOT correct code, teaching purpose only
        
        """
        def rec_happy(n):
            sz= str(n)
            sum= 0
            for e in sz:
                sum+=int(e)**2
            if(sum==1):
                return True
            else:
                return rec_happy(sum)
        return rec_happy(n)