Limit Entry Widget contents to only accept Integer and max character length

I want to limit the input of an Entry widget to 2 characters maximum and to only accept numbers as an input.

I have managed to limit to 2 characters maximum this works, but what i cant get to work is the limiting it to only numbers

When I change my variable to IntVar() there is no longer a character limit enforced.

#Import TKinter module for GUI
import tkinter as tk
from tkinter import ttk
from tkinter import font
from tkinter import messagebox
from tkinter import *

#Create GUI Screen
#Create Notebook GUI Widget
root = Tk()
note = ttk.Notebook(root)

#------------------------------------------------------------------------------

def limit_size(*args): #Limit Entry Field to 2 Characters
    value1 = str(Rev_Maj_Value1.get())
    if len(value1) >2:Rev_Maj_Value1.set(value1[:2])

def limit_size1(*args):
    value2 = str(Rev_Min_Value2.get())
    if len(value2) >2:Rev_Min_Value2.set(value2[:2])

def limit_size2(*args):
    value3 = str(Rev_Maj_Value3.get())
    if len(value3) >2:Rev_Maj_Value3.set(value3[:2])

def limit_size3(*args):
    value4 = str(Rev_Min_Value4.get())
    if len(value4) >2:Rev_Min_Value4.set(value4[:2])

#------------------------------------------------------------------------------

Tab5 = ttk.Frame(note)

canvas5 = Canvas(Tab5, width=550, height=350)
canvas5.pack()

#Entry Field

Rev_Maj_Value1 = StringVar()
Rev_Maj_Value1.trace('w', limit_size)

Rev_Min_Value2 = StringVar()
Rev_Min_Value2.trace('w', limit_size1)

Rev_Maj_Value3 = StringVar()
Rev_Maj_Value3.trace('w', limit_size2)

Rev_Min_Value4 = StringVar()
Rev_Min_Value4.trace('w', limit_size3)

Rev_Maj1 = Entry(Tab5, justify="center", width=10, textvariable=Rev_Maj_Value1)
Rev_Maj1.insert(0, "00") #Default Value
Rev_Maj1__Window = canvas5.create_window(425, 175, anchor = 'sw', window = Rev_Maj1)

Rev_Min2 = Entry(Tab5, justify="center", width=10, textvariable=Rev_Min_Value2)
Rev_Min2.insert(0, "00") #Default Value
Rev_Min2__Window = canvas5.create_window(425, 225, anchor = 'sw', window = Rev_Min2)

Rev_Maj3 = Entry(Tab5, justify="center", width=10, textvariable=Rev_Maj_Value3)
Rev_Maj3.insert(0, "00") #Default Value
Rev_Maj3__Window = canvas5.create_window(425, 275, anchor = 'sw', window = Rev_Maj3)

Rev_Min4 = Entry(Tab5, justify="center", width=10, textvariable=Rev_Min_Value4)
Rev_Min4.insert(0, "00") #Default Value
Rev_Min4__Window = canvas5.create_window(425, 325, anchor = 'sw', window = Rev_Min4)

#------------------------------------------------------------------------------

#Create Notepad tabs

note.add(Tab5, text = " 5 ")
note.pack()

#------------------------------------------------------------------------------

root.mainloop()

I want to limit the input of an Entry widget to 2 characters maximum and to only accept numbers as an input.

Don't use StringVar(). Use simply Entry.get()

You would do something like this by using isdigit() and do same as other methods.

Snippet:

def limit_size(*args): #Limit Entry Field to 2 Characters
    if not Rev_Maj1.get().isdigit():
           messagebox.showinfo('warning', 'Please enter number')
           Rev_Maj1.delete(0, END)
               
    value1 = Rev_Maj1.get()     
    if len(value1) >2:Rev_Maj_Value1.set(value1[:2]) 
                 

def limit_size1(*args):
    if not Rev_Min2.get().isdigit():
        messagebox.showinfo('warning', 'Please enter number')
        Rev_Min2.delete(0, END)
        
    value2 = str(Rev_Min_Value2.get())
    if len(value2) >2:Rev_Min_Value2.set(value2[:2])

def limit_size2(*args):
    if not Rev_Maj3.get().isdigit():
        messagebox.showinfo('warning', 'Please enter number')
        Rev_Maj3.delete(0, END)

    value3 = str(Rev_Maj_Value3.get())
    if len(value3) >2:Rev_Maj_Value3.set(value3[:2])

def limit_size3(*args):
    if not Rev_Min4.get().isdigit():
        messagebox.showinfo('warning', 'Please enter number')
        Rev_Min4.delete(0, END)

    value4 = str(Rev_Min_Value4.get())
    if len(value4) >2:Rev_Min_Value4.set(value4[:2