from tkinter import *
def messagebox():
toplevel = Toplevel(root)
toplevel.title("QUIT")
toplevel.geometry("300x100")
l1=Label(toplevel, image="::tk::icons::question")
l1.grid(row=0, column=0, pady=(7, 0), padx=(10, 30), sticky="e")
l2=Label(toplevel,text="Are you sure you want to Quit")
l2.grid(row=0, column=1, columnspan=3, pady=(7, 10), sticky="w")
b1=Button(toplevel,text="Yes",command=root.destroy,width = 10)
b1.grid(row=1, column=1, padx=(2, 35), sticky="e")
b2=Button(toplevel,text="No",command=toplevel.destroy,width = 10)
b2.grid(row=1, column=2, padx=(2, 35), sticky="e")
root = Tk()
root.geometry("300x200")
root.title("Main Window")
Button(root,text="Quit",command=messagebox,width = 7).pack(pady=80)
root.mainloop()