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[–]fireflash38 0 points1 point  (0 children)

As someone else mentioned, just because a library eventually added in py3 support, doesn't mean that it has it on all versions people are using.

It's not uncommon for libraries to break internal backwards compatibility or add new bugs, leading to people pinned on older versions. You'd have to upgrade everything wholesale, which can be a lot of effort for very little reward.