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He claims there's no migration guide, but when I google on the phrase he used, "Migration from Python 2 to 3 Guide", or any variation of that phrase, the first hit is https://docs.python.org/3/howto/pyporting.html I wonder why he didn't find it.

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And when 2to3 didn't work, he didn't attempt `2to3 --help`?

I guess if everything went smoothly, he wouldn't have had a blog post to write.

That is not an actual migration guide. It's merely a meta-doc saying what types of things you need to pay attention to. I was looking for a specific list of things that would have to be migrated. The docs mention of reading the release notes for each versino of Python 3 isn't very helpful.

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