Update the applications of deque.

codes/python/chapter_array_and_linkedlist/my_list.py

@@ -40,7 +40,7 @@ class MyList:
         """ 尾部添加元素 """
         # 元素数量超出容量时，触发扩容机制
         if self.size() == self.capacity():
-            self.extend_capacity();
+            self.extend_capacity()
         self.__nums[self.__size] = num
         self.__size += 1