Tkinter – Unable to figure out how to update windows

January 30, 2022

First off, I’m new to coding. And I’m following a course on it. But in the meantime I want to test myself and figure things out for myself and "learn on the job" a bit with more hands on coding that I can use right away.

I’ve written below code to try and figure out to make a main window with 2 buttons. If I press a button, it should change the screen into the second/third screen. But instead if I fire up my exe.
It opens all 3 windows right away in separate windows. And once I press a button it opens another window. But what I would want is that the main window get’s "updated" to show only the labels/pictures/buttons etc (which I did not include in the .py yet).

from tkinter import *

def second_window1():
    second_window1 = Toplevel(main)
    second_window1.title("Second window")
    second_window1.geometry("414x896")
    Label(second_window1, text ="This is the second window")#.pack()

def third_window1():
    third_window1 = Toplevel(main)
    third_window1.title("Third window")
    third_window1.geometry("414x896")
    Label(third_window1, text ="This is the third window")#.pack()  

main = Tk()
main.title("Main Screen")
main.geometry('414x896')
main.configure(background = "azure2")
main.resizable(False, False)

Label(main, text = "Label_1", fg = "chartreuse2", bg = "ghostwhite", font = "Helvetica 16 bold").grid(row=1, column=1)

second_window = Tk()
second_window.title("Second Screen")
second_window.geometry('414x896')
second_window.configure(background = "azure2")
second_window.resizable(False, False)

Label(main, text = "Label_2", fg = "chartreuse2", bg = "ghostwhite", font = "Helvetica 16 bold").grid(row=1, column=1)

third_window = Tk()
third_window.title("Third Screen")
third_window.geometry('414x896')
third_window.configure(background = "azure2")
third_window.resizable(False, False)

Label(main, text = "Label_3", fg = "chartreuse2", bg = "ghostwhite", font = "Helvetica 16 bold").grid(row=1, column=1)

btn = Button(main, text ="Second Screen", command = second_window1).grid(row=1, column=1)
btn = Button(main, text ="Third Screen", command = third_window1).grid(row=2, column=1)

mainloop()

enter image description here