calculator.py help

[dijkhuis at my-deja.com]

Hello,

Can someone please help me with the following code?
I found this example somewhere but it won't work.
It is supposed to be a calculator.
Thanks,

Dijkhuis
------

from Tkinter import *
from math import *

def evaluate(event):
    label['text']="result: " + str(eval(expression.get()))

frame = Frame(None)

entry = Entry(frame)
entry['textvariable'] = expression = StringVar()
entry.bind("",evaluate)

label = Label(frame)

button = Button(frame, text = "Submit", command = evaluate)

frame.pack()
entry.pack()
label.pack()
button.pack()
frame.mainloop()


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