from tkinter import *

window = Tk()

window.title("Welcome to Tkinter!")
window.geometry('400x300+30+200')


chk_state = BooleanVar()
chk_state.set(True)  #set check state

chk = Checkbutton(window, text='Choose', var = chk_state)
chk.grid(column=0, row=0)



window.mainloop()