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"examples/python/gi/checkpoint.py" is not only an example. It's also a useful script for testing checkpoints. Support a "--last" argument to specify the last checkpoint created. Otherwise, when you are using this example from a test script, it can be cumbersome to find the right checkpoint point. Also, rename "client" and "nm_client" variables to "nmc". The purpose of using the same variable name for the same thing is readability, but also it works better when copy+paste snippets into the Python REPL.
These examples show how to call libnm from Python using GObject introspection.