在升序数组 nums 中寻找目标值 target，下列程序可以填入的是（    ）

class Search(object):

      def search(self, nums, target):

            left, right = 0, len(nums) - 1

            while left <= right:

                  ________________________________________

                  if nums[mid] == target:

                        return mid

                  elif nums[mid] > target:

                        right = mid - 1

                  else:

                        left = mid + 1

            return -1