find peak element

class Solution:
    def findPeakElement(self, nums: List[int]) -> int:
        if len(nums) <= 1:
            return 0

        low, high = 0, len(nums) - 1

        while low <= high:
            mid = low + (high-low)//2

            if mid < len(nums) - 1 and nums[mid] < nums[mid+1]:
                low = mid + 1
            elif mid > 0 and nums[mid] < nums[mid-1]:
                high = mid - 1
            else:
                return mid