from gi.repository import GObject class Person(GObject.Object): __gproperties__ = { 'name': (GObject.TYPE_STRING, 'Name', 'The name of the person', 'unknown', GObject.ParamFlags.READWRITE) } def __init__(self): GObject.Object.__init__(self) self._name = 'unknown' def get_property(self, prop): if prop.name == 'name': return self._name else: raise AttributeError('Unknown property ' + prop.name) def set_property(self, prop, value): if prop.name == 'name': self._name = value else: raise AttributeError('Unknown property ' + prop.name)In this code, we have defined `name` as a property with a default value of `'unknown'` that can be read and written to using the `get_property` and `set_property` methods. The package library for gi.repository is `python3-gi`, which can be installed using the package manager of your operating system.