title: how to destroy this tkinter window
body: <p>Please, how can I destroy this tkinter window?</p>
  
  <pre><code>from Tkinter import *
  import time
  
  def win():
      root = Tk()
  
      root.wait_visibility(root)
      root.attributes('-alpha', 0.7)
  
      root.overrideredirect(True)
      root.configure(background='black')
      root.wm_attributes("-topmost", 1) #zostane navrchu
      w = 200 # width for the Tk root
      h = 50 # height for the Tk root
      # get screen width and height
      ws = root.winfo_screenwidth() # width of the screen
      hs = root.winfo_screenheight() # height of the screen
      # calculate x and y coordinates for the Tk root window
      x = (ws/2) - (w/2)
      y = hs - h - 50 #(hs/2) - (h/2)
  
      lab = Label(root, text="Hello, world!")
      lab.pack()
  
      #x = 50
      #y = 50
      root.geometry('%dx%d+%d+%d' % (w, h, x, y))
      root.mainloop()
  
  app = win()
  app.destroy() #not working
  </code></pre>