How to debug Python IDLE?

[ryguy7272]

I'm wondering how to debug code in IDLE Python 3.4.  I found this.
http://www.cs.uky.edu/~paulp/CS115F11/notes/debug/debug.html

That looks pretty helpful, but mine is nothing like that.  All my controls are greyed out.  The debugger does basically...nothing.  All I get is messages like this.

[DEBUG ON]
>>> 
[DEBUG OFF]
>>> 
[DEBUG ON]
>>> 

It doesn't debug anything at all.

Any idea what's wrong?
Thanks.