diff --git a/codes/python/chapter_stack_and_queue/linkedlist_queue.py b/codes/python/chapter_stack_and_queue/linkedlist_queue.py
index 2ab7196d3..982033a54 100644
--- a/codes/python/chapter_stack_and_queue/linkedlist_queue.py
+++ b/codes/python/chapter_stack_and_queue/linkedlist_queue.py
@@ -30,7 +30,7 @@ class LinkedListQueue:
         # 尾结点后添加 num
         node = ListNode(num)
         # 如果队列为空，则令头、尾结点都指向该结点
-        if self.__front == 0:
+        if self.__front is None:
             self.__front = node
             self.__rear = node
         # 如果队列不为空，则将该结点添加到尾结点后
diff --git a/docs/chapter_stack_and_queue/queue.md b/docs/chapter_stack_and_queue/queue.md
index c7bf098c5..530d16a48 100644
--- a/docs/chapter_stack_and_queue/queue.md
+++ b/docs/chapter_stack_and_queue/queue.md
@@ -412,7 +412,7 @@ comments: true
             # 尾结点后添加 num
             node = ListNode(num)
             # 如果队列为空，则令头、尾结点都指向该结点
-            if self.__front == 0:
+            if self.__front is None:
                 self.__front = node
                 self.__rear = node
             # 如果队列不为空，则将该结点添加到尾结点后