Arch Linux

To have less manual interaction with PKGBUILDs when upgrading the Python interpreter, the version strings should not be hardcoded (e.g. `python3.10`).

To get the (major.minor) version string of the Python available during build, use [1]:

```
local python_version=$(python -c 'import sys; print(".".join(map(str, sys.version_info[:2])))')
```

To get the site-packages directory of the Python available during build, use [2]:

```
local site_packages=$(python -c "import site; print(site.getsitepackages()[0])")
```

[1] https://wiki.archlinux.org/title/Python_package_guidelines#Using_python_version
[2] https://wiki.archlinux.org/title/Python_package_guidelines#Using_site-packages