Systemd homepage. Has links to documentation, FAQs, and everything that might be useful in putting up with systemd.
Python module for native access to the systemd facilities. Functionality is separated into different sub-modules: journal, daemons and sockets, machine and boot identifiers, and login. Appears packaged for all of the big distros already.
About as official as it gets. Documentation: https://www.freedesktop.org/software/systemd/python-systemd/
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