Tkinter列表框如何判断是否选择了一个项目

问题描述

我正在尝试创建一个允许用户按下按钮的简单 GUI，这将从显示的列表框中删除一个条目.但是，如果未选择任何条目，则控制台将引发错误，因此我将如何确定用户是否选择了条目.这是我的代码:

I am trying to create a simple GUI that allows the user to press a button, which will delete an entry from a shown Listbox. However, the console throws an error if no entry is selected, so how would I determine if the user has selected an entry. Here's my code:

selection = self.recipe_list.curselection()
    if not selection is None:
        self.recipe_list.delete(selection)
    else:
        print("Nothing to delete!")

推荐答案

而不是像您要检查的那样返回 None ，它返回一个空字符串，" .检查是否如下:

Instead of returning None like you're checking for, it returns an empty string, "". Check for that as follows:

if selection:
    self.recipe_list.delete(selection)
else:
    print("Nothing to delete!")

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