add a new python version

Author: FEI120483

problems/0977.有序数组的平方.md

@@ -178,6 +178,24 @@ class Solution:
         return sorted(x*x for x in nums)
 ```
 
+```Python
+(版本四) 双指针+ 反转列表
+class Solution:
+    def sortedSquares(self, nums: List[int]) -> List[int]:
+        #根据list的先进排序在先原则
+        #将nums的平方按从大到小的顺序添加进新的list
+        #最后反转list
+        new_list = []
+        left, right = 0 , len(nums) -1
+        while left <= right:
+            if abs(nums[left]) <= abs(nums[right]):
+                new_list.append(nums[right] ** 2)
+                right -= 1
+            else:
+                new_list.append(nums[left] ** 2)
+                left += 1
+        return new_list[::-1]
+
 ### Go：
 
 ```Go