326. Power of Three-3的幂

Given an integer n, return true if it is a power of three. Otherwise, return false.

An integer n is a power of three, if there exists an integer x such that n == 3x.

Example 1:
Input: n = 27
Output: true

Example 2:
Input: n = 0
Output: false

Example 3:
Input: n = 9
Output: true

Example 4:
Input: n = 45
Output: false

Constraints:
-2^31 <= n <= 2^31 - 1

Follow up: Could you do it without using any loop / recursion?

Solution in python:

class Solution:
    def isPowerOfThree(self, n: int) -> bool:
        if n <= 0:
            return False
        while n > 1:
            if n%3 == 0:
                n //= 3
                continue 
            else:
                return False
        return True