Dropping Python 2 support

[pradyunsg]

My proposal: Drop it in 21.0. :)

Holler if you're not on board.

[ShadowJonathan]

Py2 is EOL, it would only make sense.

What minimal py3 version will be supported from now on then? I saw this being referenced from a PR in the context of typing, with typing annotations being added only in 3.5 (iirc)

[brettcannon]

@ShadowJonathan it will depend on what pip chooses to support at the time we drop this.

[pradyunsg]

I'd imagine we'll drop Python 3.5 as well (since it'll be EoL by Jan 2021), or at least, we'll drop it immediately after pip drops it.

[pradyunsg]

Since no one is opposed to this, I say it's decided that we'll drop support for Python 2 from packaging in early 2021.

[pradyunsg]

I'd say we should also deprecate 3.4 and 3.5 at the same time, since they're also EOL.

[brettcannon]

So when are we going to do this? It's 2021 and @jdufresne was nice enough to beat all of us to a PR. Any reason to wait? Is one last Python 2 release necessary for Apple Silicon support?

[brettcannon]

Release 20.9 is out. Any reason to put this off any longer?

[pradyunsg]

Nope.

[brettcannon]

Done! 🥳🎉🎊🍾 (there aren't enough emojis for this 😁).