How to initialize a prewritten function within a function?

Question

I have 2 functions: one that opens a certain window with buttons, and the other one that does stuff that I need and closes a window. It works fine if I defy second function within the first one, but I need them to be separate, and that's the problem.

If I separate them "newWindow" is undefined in "sleep" and therfore program doesn't work.

from re import I
from tkinter import *
from tkinter.ttk import *
from array import *

def sleep(): # only closes a window for now
        newWindow.destroy()

def openNewWindow():
    
    # Toplevel object which will 
    # be treated as a new window
    newWindow = Toplevel()
 
    # sets the title of the
    # Toplevel widget
    newWindow.title("Action")
 
    # sets the geometry of toplevel
    newWindow.geometry("800x400")
        


    for r in range(6):
        btSle = Button(newWindow, text = "Sleep", command = sleep)

        
        btSle.grid(row = r, column = 1, sticky = W, pady = 2)

Answer 1

Have you tried adding a "global NewWindow"?

from re import I
from tkinter import *
from tkinter.ttk import *
from array import *

def sleep():
    newWindow.destroy()
def openNewWindow():
    global newWindow # makes the variable visible to each function
    newWindow = Toplevel()
    newWindow.title("Action")
    newWindow.geometry("800x400")
    for r in range(6):
        btSle = Button(newWindow, text = "Sleep", command = sleep)
        btSle.grid(row = r, column = 1, sticky = W, pady = 2)