Tkinter app=App(root) problem

This is my first day working with Tkinter. I'm using python2.3 on
WindowsXP. I found this program and entered it.

from Tkinter import *

class App:
def _init_(self,master):
frame = Frame(master)
frame.pack()

self.button = Button(frame, text = "Quit", fg = "red", command
=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()

When I run the code in IDLE I get the initial frame but no buttons with
the following error:

Traceback (most recent call last):
File "C:\Documents and Settings\INTERNET\Desktop\hello2.py", line 18,
in ?
app = App(root)
TypeError: this constructor takes no arguments

I have also tried to save the program as with a pyw extension. Nothing
happens when I try to run it with that extension.

.

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