the `xattr` terminal command relies on the system installed Python, though this seems to be the only example.
If you look at the source in `/usr/bin/xattr` it does some work to deal with different versions of Python. All the work ultimately gets handled by the xattr module preinstalled with the system Python. This module has Apple's copyright in it and is different than the `xattr` module on pypi.
Wonder how this Python one-off in macOS came to be.
