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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Tkinter menu crash
Date: Tue, 05 Aug 2014 17:43:08 -0400
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On 8/5/2014 8:15 AM, Nicholas Cannon wrote:
> Ok so the first part of the program(until the start of the menu) worked fine. It ran  and did what I wanted it to do.

What x.y.z version of Python. How did you run it, exactly?

> I wanted to then implement a new menu(for practise) and then it crashes. Don't know why but it just crashes.

If you ran from Idle editor on Windows, start Idle with 'python -m 
idlelib' in Command Prompt to see tk error messages.

However, when I pasted code into 3.4.1 Idle Editor, changed first two 
lines to

from tkinter import *
from tkinter import messagebox as tm

and ran -- no crash, no error message, no menu. I entered text into box, 
clicked Submit text, and OK on popup, and nothing happens.
See below for why no menu.

When you ask about a problem, please reduce code to the minimum that 
exhibits the problem for you.

> (also tips on the code will be appreciated and I gave just started Tkinter programming)

A different issue.

> Here is the code:
>
>
> from Tkinter import *
> import tkMessageBox as tm
>
> def submit():
>      #message box with yes no
>      tm.askyesno(title='Submit Text', message='Are you sure....')
>
> def info():
>      tm.showinfo(title='About', message='Just a test Tkinter UI sample')
>
>      #getting the text from the entrybox and
>      #packs it into a label
>      mtext = text.get()
>      label1 = Label(app, text=mtext)
>      label1.pack()
>
> #root window setup
> root = Tk()
> root.geometry('480x480+200+200')
> root.title('Basic Tk UI')
>
> #frame set up
> app = Frame(root)
> app.pack()
>
> #variable and entry box set up
> text = StringVar()
> entry = Entry(app, textvariable=text)
> entry.pack()
>
> #button set up
> button1 = Button(app, text='Submit text', command= submit)
> button1.pack()
>
> #menu construction
> menubar = Menu(root)
>
> filemenu = Menu(menubar)
> filemenu.add_command(label='About', command= info)
> filemenu.add_command(label='Quit', command= root.destroy)
> filemenu.add_cascade(label='TK UI Sample', menu=filemenu)

Adding filemenu as a submenu of filemenu leads to infinite loop regress. 
On 3.4.1 with tcl/tk 8.6, this does not crash, but it might on an 
earlier version of Python and tcl/tk.

Since menubar is left empty, it is not displayed.  Fix both problems with

menubar.add_cascade(label='TK UI Sample', menu=filemenu)



> root.config(menu=menubar)
>
>
>
> #loop to listen for events
> root.mainloop()
>


-- 
Terry Jan Reedy