DEP: Minimum supported Python version 3.10

[snowman2]

Python 3.9 is no longer supported in the scientific python ecosystem: https://scientific-python.org/specs/spec-0000/

Related #1111

[djhoese]

Ah so pyproj follows scipy instead of numpy which doesn't drop 3.9 until April:

https://numpy.org/neps/nep-0029-deprecation_policy.html

[djhoese]

Ah sorry, numpy drops 3.8 in April if I'm reading that right.

[snowman2]

Ah so pyproj follows scipy instead of numpy which doesn't drop 3.9 until April:

https://numpy.org/neps/nep-0029-deprecation_policy.html

The note at the top: "This NEP is superseded by the scientific python ecosystem coordination guideline SPEC 0 — Minimum Supported Versions."

[jjimenezshaw]

Ubuntu LTS users (like me) will have only a few months to move to Ubuntu 24.04 (with python 3.12).
That applies as well for PROJ docker image.

[snowman2]

Ubuntu LTS users (like me) will have only a few months to move to Ubuntu 24.04 (with python 3.12). That applies as well for PROJ docker image.

The dead snakes ppa is a great resource: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa. pyproj uses it to test pyproj on Ubuntu with newer versions of Python in GitHub actions.