[Python] Global module variable doesn't change after being imported [duplicate]

I have a function that makes two global variables upon import. Another function turns those variables into IntVars, but it doesn't update them for the code that uses the module.

AliasTkFunctions contains this code, which should set the vars, then change them to IntVars:

rows_ = None
columns_ = None


def initiate_grid(window):
from tkinter import IntVar
global rows_, columns_

rows_ = IntVar()
rows_.trace("w", lambda *_: [window.rowconfigure(a, weight=1) for a in range(rows_.get())])

columns_ = IntVar()
columns_.trace("w", lambda *_: [window.columnconfigure(a, weight=1) for a in range(columns_.get())])

print("Initiate Grid")


def grid(window, rows=None, columns=None, clear=True):
global rows_, columns_

if clear:
[b.destroy() for b in window.winfo_children()]

if rows is not None:
rows_.set(rows)

if columns is not None:
columns_.set(columns)

print("Grid Changed")


This code should set the grid to 5x5 and fill everysquare with a random coloured square:

from tkinter import Tk, Label

from AliasTkFunctions import fix_resolution_issue, resize_window, initiate_grid, grid
from AliasColourFunctions import random_hex_colour

fix_resolution_issue()

main = Tk()
resize_window(main, 4, 4, False)
main.resizable(False, False)
main.title("Placeholder")

initiate_grid(main)
grid(main, 5, 5)

for c in range(columns_.get() + 1):
for r in range(rows_.get()):
Label(background=random_hex_colour()).grid(row=r, column=c, sticky="nsew")


With this code, it gives me this error:

Traceback (most recent call last):
File "C:\Users\dandr\Code\PycharmProjects\Python Projects 2\Random Colours.py", line 16, in <module>
for c in range(columns_.get() + 1):
^^^^^^^^
NameError: name 'columns_' is not defined
Initiate Grid
Grid Changed

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