From 1a8b4f63640e157d577a560371cb61685280b141 Mon Sep 17 00:00:00 2001
From: Rui <58332748+wodray@users.noreply.github.com>
Date: Tue, 21 Jan 2025 18:46:41 +0800
Subject: [PATCH] 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."
---
 codes/python/chapter_stack_and_queue/linkedlist_deque.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/codes/python/chapter_stack_and_queue/linkedlist_deque.py b/codes/python/chapter_stack_and_queue/linkedlist_deque.py
index 0a39c95c8..29aa0dfa1 100644
--- a/codes/python/chapter_stack_and_queue/linkedlist_deque.py
+++ b/codes/python/chapter_stack_and_queue/linkedlist_deque.py
@@ -69,7 +69,7 @@ class LinkedListDeque:
             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 @@ class LinkedListDeque:
             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