In Python, the pop() method is used to remove the last element of the given list and return the removed item. The pop() method can optionally accept an integer argument. It is the index of the element that we want to remove, so if we call exampleList.pop(0), the first element wil...
Basically, we just get the length of the list and subtract that length by one. That gives us the index of the last item in the list. The main drawback with a solution like this is the time complexity. In order to access the last element, we have to compute some expression which ...
magicians = ['alice', 'david', 'carolina'] for magician in magicians: print(magician.title() + ", that was a great trick!") print("I can't wait to see your next trick, " + magician.title() + ". ") print("Thank you, everyone. That was a great magic show!") 你在前面看到了...
Listbox 列表框控件 以列表的形式显示文本 Menu 菜单控件 菜单组件(下拉菜单和弹出菜单) Menubutton 菜单按钮控件 用于显示菜单项 Message 信息控件 用于显示多行不可编辑的文本,与 Label控件类似,增加了自动分行的功能 messageBox 消息框控件 定义与用户交互的消息对话框 OptionMenu 选项菜单 下拉菜单 PanedWindow 窗口...
# i 表示索引值,item 表示值,根据索引值的位置依次插入 for i,item in enumerate(range(1,50)): listbox1.insert(i,item) listbox1.pack() # 设置滚动条,使用 yview使其在垂直方向上滚动 Listbox 组件的内容,通过绑定 Scollbar 组件的 command 参数实现 ...
顾名思义,迭代器,自然就是用来做迭代用的(好像是废话)。以list为例,我们用list,最多的情况就是用来做循环了(循环就是迭代嘛) >>> list = [1,2,3] >>> dir(list) ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__...
self.show() # 获取文件夹路径 def table_click(self): # 获取选中文本所在的列 item_list = self.table_widget.selectedItems() for item in item_list: print(item.text()) # 选中行 row = self.table_widget.currentRow() # 选中列 column = self.table_widget.currentColumn() ...
我们将使用QListWidget中的itemDoubleClicked信号来触发此方法,该方法将QListItemWidget对象传递给其回调。我们只需通过调用其data()访问器方法从列表项中检索 URL,然后将 URL 传递给当前可见的 web 视图。 现在,回到__init__(),我们将连接信号到回调如下: ...
"allow_share_show_profile": false, "allow_show_in_gossip": false, "allow_show_my_action": false, "allow_strange_comment": false, "allow_unfollower_comment": false, "allow_use_linkmic": false, "bg_img_url": "", "birthday_description": "", "birthday_valid": false, "block_status"...
15.last_browse :当前用户最近一次浏览的时间间隔 16.last_SavedCart :当前用户最近一次添加商品到购物车的时间间隔 17.last_Order :当前用户最近一次下单的时间间隔 18.interval_buy :当前用户最近两次购买的间隔天数 19.browse_not_buy :当前用户浏览了商场后是否没有购买商品 ...