def METHOD_NAME(self):
    installable = client.system.listLatestInstallablePackages(
        self.session_key, SERVER_ID)
    install_these = []
    for pkg in installable[0:3]:
        install_these.append(pkg['package_id'])
    earliest = datetime.now() + timedelta(3) # 3 days from now
    dt = xmlrpclib.DateTime(earliest.timetuple())
    client.system.schedulePackageInstall(self.session_key, SERVER_ID,
        install_these, dt)