From f36eb15b8413d9a23eae7b2801d360ecc0fd72bf Mon Sep 17 00:00:00 2001
From: scyes <scyeah@qq.com>
Date: Mon, 4 Mar 2019 14:15:54 +0800
Subject: [PATCH] remove wrong code, add dequene() return
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1. 去掉下面的错误代码
<<<<<<< HEAD
                    self._data[i] = self._items[i + self._head]
=======
2. 按照课程中的java代码，增加“队列为空时，返回None”
---
 python/09_queue/array_queue.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/python/09_queue/array_queue.py b/python/09_queue/array_queue.py
index 19c6b79..1c34b01 100644
--- a/python/09_queue/array_queue.py
+++ b/python/09_queue/array_queue.py
@@ -21,11 +21,7 @@ class ArrayQueue:
                 return False
             else:
                 for i in range(0, self._tail - self._head):
-<<<<<<< HEAD
-                    self._data[i] = self._items[i + self._head]
-=======
                     self._items[i] = self._items[i + self._head]
->>>>>>> upstream/master
                 self._tail = self._tail - self._head
                 self._head = 0
         
@@ -38,6 +34,8 @@ class ArrayQueue:
             item = self._items[self._head]
             self._head += 1
             return item
+        else:
+            return None
     
     def __repr__(self) -> str:
         return " ".join(item for item in self._items[self._head : self._tail])