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Rather heavy Python user here, though a little bit less over the last year: I think the whole thing is largely overblown. I've fully migrated to Python3 three years ago, was expecting horror given all the articles and 2vs3 drama, yet it was done very quickly and painlessly.

I've gone through migrations that were much more tedious and painful. Not so much with languages but with dependencies/frameworks: the like of Django, Django-rest-framework, Unity 3D, and pretty much anything javascript (apart from javascript itself).

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