I now work on a python 3.6 codebase. Something like 100k lines of code. in practice 80% of the code was written for 3.5. However, barring speed improvements, t

I now work on a python 3.6 codebase. Something like 100k lines of code. in practice 80% of the code was written for 3.5. However, barring speed improvements, there isn't much to offer, apart from unicode, f strings and annotations. If python 3 had proper multithreading, that might have been worth breaking backwards compatibility for.