Recommend django<4 on older versions of Python

[jaap3]

It seems odd to recommend an unsupported version of Django on Python < 3.8

[ngnpope]

Make sure you have pip >= 9.0 and setuptools >= 24.2, then try again...

I've asked @carltongibson this before - there were long discussions in #12013 - but perhaps it is time for considering it again: Can we drop this check now and assume that users have a new enough version of pip and setuptools to support python_requires?

pip==9.0.0 was released on Nov 2, 2016 and setuptools==24.2.0 was released on Jul 21, 2016. By the time Django 4.0 is released in December this year, it'll be over five years and closing on two years since the Python 2 EOL which was the main concern when this was last brought up.

[carltongibson]

Hey @pope1ni — I was literally just about to ping you. 😀

IMO, yep, it's time for all of this to go. (@felixxm You have opinions?)

[carltongibson]

1.11 was the last version compatible with Python 2 though no?

[ngnpope]

Yes, but as REQUIRED_PYTHON is 3.8, if CURRENT_PYTHON were 3.7, this would trigger. You'd be told to install django<2 when higher versions are supported by Python 3.7.

[ngnpope]

IMO, yep, it's time for all of this to go.

See #14264.

[carltongibson]

Ok, super. @jaap3 I'm going to close this in favour of the more ambitious approach. Thanks.

[jaap3]

No problem, happy to be the catalyst of more ambitious approaches ;-)