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just something free with simple debugging.
That's a lot to ask for, really. I suggest you go for nothing more than syntax highlighting, and debug yourself. It's worth it, trust me. At any rate, debugging is half the fun!
Get notepad++ and the python highlighter (does it come with it? I dunno) and you should be fine.
Seriously. Don't bother with a debugger until you can debug most issues on your own. Debuggers are cheat codes, and you haven't earned them yet.