libblockdev/python gobject-introspection ("gi") API reference:
https://lazka.github.io/pgi-docs/

example of using above for LVM:
https://github.com/storaged-project/libblockdev/blob/master/tests/lvm_test.py


using libnm with pygobject-introspection examples:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/blob/master/examples/python/gi/
NM.SETTING_CONNECTION_TYPE = https://developer.gnome.org/NetworkManager/stable/ch01.html
https://developer.gnome.org/libnm/stable/ch03.html