Unfortunately since libnm-glib/libnm-util make heavy use of
GHashTable and GValue, functions that deal with these types
can't be used from Python when using GObject Introspection,
since pygobject can't handle conversion between python types
and GValue/GHashTable very well. You'll likely encounter
assertions like:
ERROR:pygi-argument.c:1755:_pygi_argument_to_object: assertion failed: (g_type_info_get_tag (key_type_info) != GI_TYPE_TAG_VOID)
Aborted