如何检查 Python Tkinter 中是否存在菜单项

Question

在 python tkinter 我有以下代码用于创建只有 2 个菜单项的 Menu：

my_menu = Menu(root, tearoff=False)
my_menu.add_command(label="Show details", command=whatever)
my_menu.add_command(label="Delete me", command=something)

现在我想添加一个if语句来检查菜单项：删除我是否存在于菜单中。如果存在，则删除该菜单项（如以下代码片段，仅用于演示）

if... :                                  #if statement to check if menu item "Delete me" exists
    my_menu.delete("Delete me")          #delete the menu item
else:
    pass

Answer 1

有很多方法可以做到这一点，但最动态的方法是获取最后一项的索引，循环直到最后一个索引号，然后进行检查：

from tkinter import *

root = Tk()

def whatever():
    for i in range(my_menu.index('end')+1):
        if my_menu.entrycget(i,'label') == 'Delete me': # Delete if any has 'Delete me' as its label
            my_menu.delete("Delete me")

my_menu = Menu(root, tearoff=False)
my_menu.add_command(label='Show details', command=whatever)
my_menu.add_command(label='Delete me')
root.config(menu=my_menu)

root.mainloop()

Answer 2

def menu_has_item(menu, label):
    try:
        menu.index(label)
        return True
    except TclError:
        return False


root = Tk()

details = "Show details"
delete = "Delete me"

my_menu = Menu(root, tearoff=False)
my_menu.add_command(label=details, command=whatever)
my_menu.add_command(label=delete, command=whatever)

root.config(menu=my_menu)

print(menu_has_item(my_menu, 'Not in'))
print(menu_has_item(my_menu, details))

这个returns以下：

False
True

如何检查 Python Tkinter 中是否存在菜单项

How to check if Menu item exists in Python Tkinter

python

tkinter

python-3.x

tkinter-menu