While I still do run into 2.7 code, even for 3 dependencies are the problem. You always use a library of some kind and that library could use a new python feature. You could pin it but then other scripts that need the new version break. And that is if you could even easily find the module and version. Just this week I helped someone troubleshoot a bug they've been trying to fix for weeks/months and it was just a matter of the library code being too new for 3.6. It's an ever growing planned mess.
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