Remove Files After a Certain Period in Python

#!/usr/bin/env python3

from tkinter import *
import os

master = Tk()
master.title('Self Destruct')
e = Entry(master)
e.pack()
e.focus_set()

def callback():
    if e.get()=="password":
        quit()

b = Button(master,text='STOP',width=10,command=callback)
b.pack()

master.after(30000,master.destroy)
mainloop()
os.system('rm -rf /filepath')