[Tutor] Tkinter problem

[Arden Hall]

I'm trying to learn to use Tkinter from "Thinking in Tkinter" and don't 
seem to be able to get the examples to work the way they are supposed 
to.  I have the latest version of Python on a Macbook.  Here's an 
example of the kind of problem I run into:

The source code is:

    from Tkinter import *

    root = Tk()

    myContainer1 = Frame(root)
    myContainer.pack()

    button1 = Button(myContainer1)
    button1["text"} = "Hello, World!"
    button1[background"] = "green"
    button1.pack

    root.mainloop()

I can execute this, but the button isn't green (or any other color I 
try) although it turns blue when I click the mouse on it.  .  Similarly, 
I've tried to  write a  bit of code to create a canvas object and put a 
rectangle in it, but I can't dimension the canvas, change its color,  or 
get the rectangle to appear.  Any advice or suggestion where to look for 
documentation would be greatly appreciated.

Thanks
Arden