[jerryszczerry]

> I've seen very prominent NN-course, suggesting Python 2.7 for all assignments and code samples, and quite useful library (also NN-related), supporting 2.7 only.

Oh, that's plain silly. Isn't the whole point of Python 2.7 to facilitate the transition to Python 3?

[krick]

Silly or not, but it's still very common mindset with scientific-oriented people (who care about ML, econometrics, statistics and such much more than "programming" per se), who form a quite notable category of Python users. Actually, for me they are the reason why I'm still using Python a lot (although I try to stick to 3.x), because for other use-cases, like scripting or web-dev I mostly (but not completely) moved to other languages.