Python Tkinter Menu widget:

Question

I've been trying to learn Tkinter and i've stumbled upon the below code while looking up Menu widget.

from tkinter import *
import tkinter.messagebox


top = Tk()

mb=  Menubutton ( top, text="condiments", relief=RAISED )
mb.grid()
mb.menu =  Menu ( mb, tearoff = 0)
mb["menu"] =  mb.menu

mayoVar = IntVar()
ketchVar = IntVar()

mb.menu.add_checkbutton ( label="mayo",
                          variable=mayoVar )
mb.menu.add_checkbutton ( label="ketchup",
                          variable=ketchVar )

mb.pack()
top.mainloop()

Now i undertand the purpose of code but am having a hard time figuring out what the below line of code is for.

mb["menu"] =  mb.menu

you don't have to put spaces around ( and ) - see PEP 8 -- Style Guide for Python Code — furas
– furas, Commented Jan 9, 2018 at 10:49
@PEP 8 -- Style Guide for Python Code – furas the code functions i just have an issue with understanding the line "mb["menu"] = mb.menu" — user9093127
– user9093127, Commented Jan 9, 2018 at 10:54
line mb["menu"] = Menu() assigns Menu ID to Menubutton - so Menubutton knows what to display. mb.menu = ... doesn't assign Menu to Menubutton and you can use any other variable ie. submenu instead of mb.menu — furas
– furas, Commented Jan 9, 2018 at 10:54
It is easier to answer for problem if code is correctly formated. — furas
– furas, Commented Jan 9, 2018 at 10:54

furas · Accepted Answer · 2018-01-09 11:00:07Z

1

mb["menu"] = Menu() assigns Menu ID to Menubutton - so Menubutton knows what to display.

mb.menu = ... doesn't assign Menu to Menubutton and you can use any other variable ie. mb.hello_world or submenu instead of mb.menu like in example below

import tkinter as tk

root = tk.Tk()

mb = tk.Menubutton(root, text="condiments", relief=tk.RAISED)
mb.grid()

submenu = tk.Menu(mb, tearoff=0)

mayo_var = tk.IntVar()
ketch_var = tk.IntVar()

submenu.add_checkbutton(label="mayo", variable=mayo_var)
submenu.add_checkbutton(label="ketchup", variable=ketch_var)

mb['menu'] = submenu

root.mainloop()

answered Jan 9, 2018 at 11:00

furas

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1 Comment

Nae Over a year ago

Further note that, mb['menu'] = submenu is practically singular option configuration equivalent of mb.config(menu=submenu) and mb.configure(menu=submenu).

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