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Fix python code style issue in linked list deque #1624

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Fix python code style issue in linked list deque #1624

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4 changes: 2 additions & 2 deletions codes/python/chapter_stack_and_queue/linkedlist_deque.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand All @@ -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
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