Update non-decreasing-array.py

Author: kamyu104

Python/non-decreasing-array.py

@@ -33,8 +33,8 @@ def checkPossibility(self, nums):
                     return False
                 if i-2 < 0 or nums[i-2] <= nums[i]:
                     prev = nums[i]    # nums[i-1] = nums[i], prev = nums[i]
-                else:
-                    prev = nums[i-1]  # nums[i] = nums[i-1], prev = nums[i]
+#               else:
+#                   prev = nums[i-1]  # nums[i] = nums[i-1], prev = nums[i]
                 modified = True
             else:
                 prev = nums[i]