Menus with Tkinter ??

Manuel Gutierrez Algaba thor at localhost.localdomain
Mon Sep 11 23:59:25 CEST 2000


On Mon,  Carles Sadurní Anguita <isard at localhost.localdomain> wrote:
>Hello,
>
>I'm learning python and tkinter and I've found an amazing "problem". Why
>does this code work
>
>--------------------- This code works --------------
>#!/usr/bin/python
>from Tkinter import *
>
>def ah():
>	print "Ah!"
>def oh():
>	print "Oh!"
>
>root = Tk()
>menubar = Menu(root)
>menuarxiu = Menu(menubar, tearoff=0)
>menuarxiu.add_command(label="Ah!", command=ah)
>menuarxiu.add_command(label="Oh!", command=oh)
>menubar.add_cascade(label="arxiu", menu=menuarxiu)
>root.config(menu = menubar)
>mainloop() 
>----------------------------------------------------
>
>and this one doesn't
>
>
>--------------------- This code doesn't work -------
>
>#!/usr/bin/python
>from Tkinter import *
>
>def ah(n):
>	print n
>
>root = Tk()
>menubar = Menu(root)
>menuarxiu = Menu(menubar, tearoff=0)
>menuarxiu.add_command(label="Ah!", command=ah(0))
>menuarxiu.add_command(label="Oh!", command=ah(1))
>menubar.add_cascade(label="arxiu", menu=menuarxiu)
>root.config(menu = menubar)
>mainloop() 
>____________________________________________________
>
>
>It prints 0 and 1 before the user pops the menu!
>

Well, 
menuarxiu.add_command(label="Ah!", command=<reference to function>)

"ah" is a reference to function.
ah(0) is a call to a function.

--- 
MGA



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