如何在optionmen tkinter python中交换值？

Question

当我按下“更改”按钮时，如何在选项菜单中更改值？

这里是我到目前为止编写的代码：

import tkinter as tk

root = tk.Tk()

options =[
"eggs","meat","chicken",
"potato"
]

variable1 = tk.StringVar()
variable1.set(options[0])

om1 = tk.OptionMenu(root,variable1,*options)
om1.pack()


variable2 = tk.StringVar()
variable2.set(options[0])

om2 = tk.OptionMenu(root,variable2,*options)
om2.pack()

button_change = tk.Button(root,text="change")
button_change.pack()


root.mainloop()

请帮助...

Answer 1

您可以通过两个OptionMenu的关联变量交换它们的值：

def swap_options():
    # save the value of first OptionMenu
    opt1 = variable1.get()
    # set the value of first OptionMenu to that of second OptionMenu
    variable1.set(variable2.get())
    # set the value of second OptionMenu to the saved value of first OptionMenu
    variable2.set(opt1)

button_change = tk.Button(root, text="change", command=swap_options)