How do I execute a code within a tk.Toplevel()

Question

I'm somewhat new to python (started in Nov.) and after complete my first "program" I'm trying to built the GUI using Tkinter. I want to put the program on a Toplevel that I've created and have it run, but all Tkinter tutorials only talk about widgets and I don't know how to specify that a code should run on a specific Toplevel window. The best I can figure is to run the in the section where I define the Toplevel as shown in the example below, but that is not working.


from tkinter import *
import tkinter as tk
root=Tk()
root.geometry("500x200")
root.title('Test')
Label(root, text="Test").pack()
def test():
    gen_win = Toplevel(root)
    gen_win.title("Test")
    gen_win.geometry("500x500")
    Label(gen_win, text="Test").pack()
    print(2+2)
btn_test=tk.Button(root, text="test", command=test).pack(fill=tk.X)
root.mainloop()

The example program (print(2+2)) doesn't print on the toplevel. Any ideas?

Code doesn't "run on a specific Toplevel window". It just runs, and if it happens to create a widget, or modify the contents of an existing widget, that change becomes visible as soon as your code returns to the mainloop. Label(gen_win, text=str(2+2)).pack() would be the simplest way to make your addition results visible in the window. — jasonharper
– jasonharper, Commented Jan 12, 2023 at 21:00
When I run this and press the button, it prints as expected. The only thing I see wrong here is the imports - you don't need from tkinter import * if you have import tkinter as tk and namespace things correctly with tk. (e.g., root = tk.Tk()). Star imports should be avoided, and import tkinter as tk is the most common practice. — JRiggles
– JRiggles, Commented Jan 12, 2023 at 21:00
@jasonharper makes me think I misunderstood your question! They're right - if you're trying to output the result of 2+2 on the Label on your Toplevel window, print() won't do that, that's not what it's for. — JRiggles
– JRiggles, Commented Jan 12, 2023 at 21:02

infernofire256 · Accepted Answer · 2023-01-12 22:43:25Z

0

@jasonharper gave the correct answer:

"Code doesn't "run on a specific Toplevel window". It just runs, and if it happens to create a widget, or modify the contents of an existing widget, that change becomes visible as soon as your code returns to the mainloop. Label(gen_win, text=str(2+2)).pack() would be the simplest way to make your addition results visible in the window."

answered Jan 12, 2023 at 22:43

infernofire256

13 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How do I execute a code within a tk.Toplevel()

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related