Tradition? ;) I only use python for deep learning, which is not really that intensive in terms of code. Also most of the code out there for deep learning works on both python 2 and 3.
Also, your phrasing invites the question. Why on earth would I use a new feature in a turing complete language? Unless using the new feature results in tangible improvements in my code, I don't see a reason to use it.
Also, your phrasing invites the question. Why on earth would I use a new feature in a turing complete language? Unless using the new feature results in tangible improvements in my code, I don't see a reason to use it.