listbox resizes when label added: tkinter

Question

I'm making a GUI using .grid() because it has lot of buttons. I've put those in an interactive Frame at the top of the screen (frameone) and I have frametwo at the bottom where I want to print out messages based on what buttons a user presses. It's a battleship game, for context. but when I make frametwo and put a listbox in it, the listbox is resized to fit the text inside. I don't want to have to resize the window every time more labels are entered. Here's a working example:

from tkinter import *
import tkinter as tk
window = Tk()
window.title("Window")
window.geometry('150x350')     #I wanted the demonstration to work for you.

def addline():                 #Adding sample text
    Label(listbox, text='this is text').grid(sticky=N+W)

frameone = Frame(window, height=10, width=10)
frameone.grid(sticky=N)        #The top where the button goes...

Label(frameone, bg='yellow', text='This is frameone\n\n\n').grid(row=0, column=0)
                               #The yellow here is where all the buttons go...
addtext = Button(frameone, text = 'Add line:', command=addline)
addtext.grid(column=0,row=1)   #Button to add text...

frametwo = Frame(window, bg='red', height=10, width=10)
frametwo.grid(sticky=W)        

listbox = Listbox(frametwo)
listbox.grid(sticky=W, pady=3, padx=3)         #This is the listbox that is wrongly resizing.

scrolltwo = Scrollbar(window, orient=HORIZONTAL)
scrolltwo.configure(command=listbox.yview)
scrolltwo.grid(sticky=S+E)     #I got lazy, I will put this on the side w/rowspan etc.

window.mainloop()

If this is a repeat question or somehow super obvious, I apologize. Also, sorry my GUI is hideous... I don't understand why this method isn't working. While looking for solutions, all I found were some very good explanations of .grid and how to make lists resize when they aren't. Everything helps, thanks.

I'm away from home today, and can't post answers from my mobile, but I found a solution a while ago and will post tomorrow. — Artemis, Jun 30 '18 at 08:34
Sorry I took so long, I forgot, and also slightly misunderstood your question. — Artemis, Jul 03 '18 at 19:13

score 1 · Accepted Answer · answered Jul 03 '18 at 19:12

You are treating the Listbox, listbox, like a Frame, when in fact it works differently. To add items to a Listbox, use it's insert function. So, to fix your problem, replace:

Label(listbox, text='this is text').grid(sticky=N+W)

With:

listbox.insert(END, 'this is text')

For more information on the tkinter Listbox widget, see the effbot documentation, here.

listbox resizes when label added: tkinter

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