def checkPossibility(self, nums: List[int]) -> bool:

handled_decreasing = False

for index in range(len(nums) - 1):

if nums[index] > nums[index + 1]:

if handled_decreasing: return False

handled_decreasing = True

if index - 1 >= 0 and nums[index - 1] > nums[index + 1] and index + 2 < len(nums) and nums[index] > nums[index + 2]:

return False