For me this article was written in reverse. For an intro I'd love to have had the 'code smell' example first to establish why I might care and when I might need this, and then dive into an example.

Can everyone please stop shoehorning in random xkcd comics where they don't belong?

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>>> Foo = type("Foo", (FooBase,), {'bar' : 42})

is not equivalent to what the blog post says it is to. FooBase should be defined before running this, and the blog post's equivalent make it look like this statement defines FooBase as well.