[bug] mypy global python version too old

[cyianor]

Problem description

I forked pyro from the dev branch at 01ccf36 and installed all dependencies with make install as in CONTRIBUTING.md. I also needed to manually install ruff and mypy to be able run make format and make lint.

During make lint I encountered the following error

mypy --install-types --non-interactive pyro scripts
/Users/xxx/.pyenv/versions/3.11.5/lib/python3.11/site-packages/numpy/_typing/_nested_sequence.py:60: error: Positional-only parameters are only supported in Python 3.8 and greater  [syntax]
Found 1 error in 1 file (errors prevented further checking)
make: *** [lint] Error 2

I saw that in setup.cfg it says that python_version = 3.7 which seems to be the problem. As soon as I change this to python_version = 3.8 all works as expected.

I assume that pyro is still meant to be usable with Python 3.7 and that is why this line is there? However, linting will then always fail when performed with newer versions of Python.

Setup

macOS 13.6
Python 3.11.5
mypy 1.5.1
numpy 1.26.0

[fritzo]

Sounds like a good reason to bump our Python version, as previously recommended by @ordabayevy