470. Implement Rand10() Using Rand7() - LeetCode Solution

# The rand7() API is already defined for you.
# def rand7():
# @return a random integer in the range 1 to 7

class Solution:
    def rand10(self):
        """
        :rtype: int
        """
        n = self.rand5()
        num2 = self.rand2()
        return n + 5 * (num2 - 1)
    
    def rand5(self):
        n = rand7()
        return n if n <= 5 else self.rand5()        
        
    def rand2(self):
        n = rand7()
        return n if n <= 2 else self.rand2()