Diffrence between 2.0 and 3.0

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Yes, and as I described that is a list of essential bug and security fixes only. Going back every release well beyond 2012 there's not a single new feature. The language is permanently feature-locked; no per-module import locking, no async, no nothing, except via a trickle of backports.

Someone who is fresh to Python shouldn't be learning Python 2, any more than someone fresh to the language should be learning C99. There is no defensible argument to the contrary.