new_contents: class Solution(object):
      def isPowerOfThree(self, n):
          """
          :type n: int
          :rtype: bool
          """
          import math
  
          if n < 1:
              return False
  
          base = 3
          eps  = 1e-13 
          log  = math.log(n, base)
      
          if abs(math.ceil(log) - log) < eps:
              log = math.ceil(log)
      
          return math.floor(log) == math.ceil(log)
  
subject: Create solution.py