Because of the formatting issues of Kindle and ePub, the negative reviews Python books get when formatting breaks in those formats, we're not sure yet it we'll publish it in mobi/epub.
That said, if you have any advice on getting Python to look good in those formats, we would love to hear it. :-)
I've written about using Sphinx to write technical books, you may find it useful: http://pedrokroger.net/2012/10/using-sphinx-to-write-books/
I see you used Pages to write the book. AFAIK Pages can export to ePub automatically (but I don't know if the result is any good). Maybe you could consider to export the ePub and distribute it with the PDF even if the ePub is a "beta" version. I think it could be useful for a lot of people.
But yes, there are a lot of poorly formatted ebooks, which is especially problematic for Python code.
I've already reached out to Danny via other mechanisms, so perhaps there will be a properly formatted Amazon version...
I understand the aversion to negative reviews. Maybe you can offer this with a disclaimer for those who bought the PDF.
(Reading an A4 PDF on an iPhone isn't really comfortable.)