[Python] How do you Make Python Tkinter Text Automatically Resize in Buttons and Labels?

I have encountered a problem while coding in Python that I cannot find a solution to. I have a tkinter grid that automatically resizes to fit the size of window it is in, but I want the text within the buttons/labels to also resize to fit the new grid. A basic example of this is below:

from tkinter import *

root = Tk()

for x in range(3):
for y in range(3):
Label(root, width = 2, height = 4, text = (y * 3 + x) + 1, relief = GROOVE).grid(row = y, column = x, sticky = N+E+S+W)
Grid.rowconfigure(root, y, weight = 1)
Grid.columnconfigure(root, x, weight = 1)

root.mainloop()


I would like the text to increase as you drag the window to expand it. How can this be done?


EDIT:

Mike - SMT's solution works well, however not with the situation I described in the comment on his reply.

Here is the code I have:

from tkinter import *
import tkinter.font as tkFont

grey = [0,1,2,6,7,8,9,10,11,15,16,17,18,19,20,24,25,26,30,31,32,39,40,41,48,49,50,54,55,56,60,61,62,63,64,65,69,70,71,72,73,74,78,79,80]
btn_list = []

filled = []
filled_ID = []

class GUI(Frame):
def __init__(self, master = None):
Frame.__init__(self, master)

self.screen_init()

self.key = None
self.keydetection = False
self.detect()
self.bind_all("<Key>", self.key_event)

def screen_init(self, master = None):
for x in range(9):
for y in range(9):
btn_list.append(Button(master, width = 40, height = 40, image = pixel, compound = CENTER, bg = "#D3D3D3" if 9 * y + x in grey else "#FFFFFF", command = lambda c = 9 * y + x: self.click(c)))
btn_list[-1].grid(row = y, column = x, sticky = N+E+S+W)
Grid.rowconfigure(root, y, weight = 1)
Grid.columnconfigure(root, x, weight = 1)

def update(self, btn_ID, number = None, colour = "#000000", master = None):
y = btn_ID // 9
x = btn_ID % 9
Button(master, width = 40, height = 40, image = pixel, text = number, compound = CENTER, fg = colour, bg = "#D3D3D3" if 9 * y + x in grey else "#FFFFFF", command = lambda c = 9 * y + x: self.click(c)).grid(row = y, column = x, sticky = N+E+S+W)

def detect(self):
self.keydetection = not self.keydetection

def key_event(self, event):
try:
self.key = int(event.keysym)
except:
print("Numbers Only!")

def click(self, btn_ID):
if btn_ID in filled:
filled_ID.pop(filled.index(btn_ID))
filled.remove(btn_ID)
window.update(btn_ID)
else:
filled.append(btn_ID)
filled_ID.append(self.key)
window.update(btn_ID, self.key)

def font_resize(event=None):
for btn in btn_list:
x = btn.winfo_width()
y = btn.winfo_height()
if x < y:
btn.config(font=("Courier", (x-10)))
else:
btn.config(font=("Courier", (y-10)))

if __name__ == '__main__':
root = Tk()
root.title("Example")
pixel = PhotoImage(width = 1, height = 1)
font = tkFont.Font(family = "Helvetica")
window = GUI(root)
root.bind("<Configure>", font_resize)
root.mainloop()


This means that the text is not in the grid when the code is originally run as the user presses a number key to select a number, and then clicks where they would like that number to appear in the grid, and this seems to break Mike - SMT's solution. Any fixes?

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