roslaunch python api access node class

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Hello, I have been trying to use the roslaunch python API (http://wiki.ros.org/roslaunch) to instantiate a node and launch it. My question is, is it possible to access the node to be dispatched variables using this API? I tried applying this example to my use-case but without any success:

import roslaunch

package = 'rqt_gui'

executable = 'rqt_gui'

node = roslaunch.core.Node(package, executable)

launch = roslaunch.scriptapi.ROSLaunch()

launch.start()

process = launch.launch(node)

print process.is_alive()

process.stop()

(from http://wiki.ros.org/roslaunch/API%20U...)

EDIT: Is there any way of getting the launched node name? That would work as well for my use-case.