Changing the options of a OptionMenu when clicking a Button

I modified your script to demonstrate how to do this:

import Tkinter as tkroot = tk.Tk()choices = ('network one', 'network two', 'network three')var = tk.StringVar(root)def refresh():    # Reset var and delete all old options    var.set('')    network_select['menu'].delete(0, 'end')    # Insert list of new options (tk._setit hooks them up to var)    new_choices = ('one', 'two', 'three')    for choice in new_choices:        network_select['menu'].add_command(label=choice, command=tk._setit(var, choice))network_select = tk.OptionMenu(root, var, *choices)network_select.grid()# I made this quick refresh button to demonstratetk.Button(root, text='Refresh', command=refresh).grid()root.mainloop()

As soon as you click the "Refresh" button, the options in network_select are cleared and the ones in new_choices are inserted.

The same, but with tk.Menu widget:

# Using lambda keyword and refresh function to create a dynamic menu.import tkinter as tkdef show(x):    """ Show menu items """    var.set(x)def refresh(l):    """ Refresh menu contents """    var.set('')    menu.delete(0, 'end')    for i in l:        menu.add_command(label=i, command=lambda x=i: show(x))root = tk.Tk()menubar = tk.Menu(root)root.configure(menu=menubar)menu = tk.Menu(menubar, tearoff=False)menubar.add_cascade(label='Choice', menu=menu)var = tk.StringVar()l = ['one', 'two', 'three']refresh(l)l = ['four', 'five', 'six', 'seven']tk.Button(root, text='Refresh', command=lambda: refresh(l)).pack()tk.Label(root, textvariable=var).pack()root.mainloop()

In case of using ttk, there is a convenient set_menu(default=None, values) method on the OptionMenu object.