Help Pliz ! stuck on page 4 of tutorial

[Adolfo]

Hello everyone, I am a newbie starting Fredrik Lundh .pdf tutorial. Running W2000.

I am stuck in page four "Hello Again" program:
When I try running it, it shows the root Python window very fast and 
dissapears. The intended Tk window with buttons: either does not 
show, or dissapears fast before I can tell it is there. The first 
program on the tutorial did run fine.

Here's the program as shown on the tutorial:

====================================================
 from Tkinter import *

class App:

   def_init-(self, master):

      frame = Frame(master)
      frame.pack()

      self.button = Button(frame, text="QUIT", fg="red", comand=frame.quit)
      self.button.pack(side=LEFT)

      self.hi_there = Button(frame, text="Hello", command=self.say_hi)
      self.hi_there.pack(side=LEFT)

   def say_hi(self):
      print "Hi there, everyone !"


root = Tk()

app = App(root)

root.mainloop()
===================================================

Any help will be much appreciated,

Adofo Aguirre
Santa Barbara, CA