This is the forum to discuss the Wrox book Beginning Python by Peter C. Norton, Alex Samuel, Dave Aitel, Eric Foster-Johnson, Leonard Richardson, Jason Diamond, Aleatha Parker, Michael Roberts; ISBN: 9780764596544
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Actually, it says you need to download PythonCard and that codeEditor is part of that. ("...downloading PythonCard. PythonCard is a set of utilities that provides an environment for programming in Python. PythonCard is a product that’s free to use and distribute and is tailor-made for writing in Python. It contains an editor, called codeEditor.")
I'm not sure why there's no link to Python Card on our download page but here it is:
I took a quick look at wxPython code, and it is very clear that it is not Python 3000 compatible. Well the book you are reading is from 2005, and that explains it.