3.5 was the first Python3 worth using according to Raymond Hettinger... but I think it was 3.6 that made dicts ordered by default and also includes f-strings. 3.6 is the one to have ;-)
3.6's order-preserving dict was first implemented by PyPy (so it's already had it for years, even in pypy2) and f-strings were back ported to pypy3 too.
dicts being ordered is still an implementation detail. The only place they are officially ordered is where the come from the catch-all keyword arguments in your function's signature.
