how to use progressbar (determinate)

progressbar_determinate.py

import ctypes
import tkinter
from tkinter import ttk

#button function
def count_up():
    if var.get() < 100:
        var.set(var.get() + 10)
    else:
        var.set(0)


if __name__ == "__main__":
    ctypes.windll.shcore.SetProcessDpiAwareness(1)
    
    root = tkinter.Tk()

    #variable for counter
    var = tkinter.IntVar(root)  

    #Progressbar(determinate)
    pb = ttk.Progressbar(
        root,
        maximum=100,        #maximum
        mode="determinate", #determinate mode
        variable=var,       #counter
        orient="horizontal",#orient
        )
    pb.pack()

    #countup button
    cb = tkinter.Button(
        root,
        text="count up",
        command=count_up,
    )
    cb.pack()

    root.mainloop()