Update linkedlist_deque.py (#1625)

According to PEP 8, "Comparisons to singletons like None should always be done with is or is not, never the equality operators."
krahets · Jan 21, 2025 · 1a8b4f6 · 1a8b4f6
1 parent 9c78c51
commit 1a8b4f6
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/codes/python/chapter_stack_and_queue/linkedlist_deque.py b/codes/python/chapter_stack_and_queue/linkedlist_deque.py
@@ -69,7 +69,7 @@ def pop(self, is_front: bool) -> int:
             val: int = self._front.val  # 暂存头节点值
             # 删除头节点
             fnext: ListNode | None = self._front.next
-            if fnext != None:
+            if fnext is not None:
                 fnext.prev = None
                 self._front.next = None
             self._front = fnext  # 更新头节点
@@ -78,7 +78,7 @@ def pop(self, is_front: bool) -> int:
             val: int = self._rear.val  # 暂存尾节点值
             # 删除尾节点
             rprev: ListNode | None = self._rear.prev
-            if rprev != None:
+            if rprev is not None:
                 rprev.next = None
                 self._rear.prev = None
             self._rear = rprev  # 更新尾节点