[WIP] Delete all Python 2 compatibility code

[berkerpeksag]

• Delete argparse code
• Delete Python 2 compatibility code from gunicorn/_compat.py
• Consider deleting gunicorn.selectors
• Delete gunicorn/http/_sendfile.py

[tilgovi]

Whoa! We going 3-only for 20+?

[berkerpeksag]

Yes :) #1195

[benoitc]

@tilgovi Why?

But yes, like said on #1195 we don't drop the support of 2.x anyway. The 19.X branch will continue to receive updates but no more new features though some backports will be possible if requested.

I think it's a good plan, anyway, maintaining 2 versions starts to be really difficult. Also it will allow us to give plain support for the async, asyncio APIS and such things.

[tilgovi]

All good!

[berkerpeksag]

FYI: I'm planning to add scripts to make backporting and release process easier.

[tilgovi]

When would you all like to branch for 20?

[tilgovi]

I would love to branch R19 off any time we're ready, and move master toward R20.

[berkerpeksag]

Superseded by #1764.