new_contents: class Solution:
      # @param {float} x
      # @param {integer} n
      # @return {float}
      def myPow(self, x, n):
          if n < 0: 
              return 1 / self.pow(x, -n)
          return self.pow(x, n)
          
      def pow(self, x, n):
          if n == 0:
              return 1
          half = self.pow(x, n/2)
          if n % 2 == 0:
              return half * half
          return half * half * x
  
subject: Create Pow_001.py