90% seems optimistic. I don't think that many Python projects are running the most recent version in production. From personal experience, upgrading to 3.7 was especially a pain because of packages that used "async" for variable/kwarg names.
That’s a very good point, in that case even 50% would probably be optimistic.
We can probably attribute this article’s novelty to the slow adoption of Python 3. In that way it’s probably a good thing that it’s such a popular topic, even if it is old news.
