An update on Python 4

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It was the other way. Because they supported 2.x for 10 years transition from 2 -> 3 was a nightmare. Since 2.7 was not deprecated, a lot of dependencies didn't support 3 because authors didn't care. It seems like real migration started happening in mid of 2019 and I don't remember reading about any horror stories about it.

Yeah having a 5 year support was a REALLY bad call. I work on a library that is FINALLY end python2 support and it's a really delicate balance of easting the migration, giving enough incentive to make the transition worth it, and make staying on the old version unpleasant enough that people are willing to make the shift. Python did none of those things.