How to set args with python roslaunch

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Hey all,

I have an rqt GUI that needs to launch a local rosnode. So I pulled in the python roslaunch lib and I can successfully kickoff the roslaunch file. However, I'd like to be able to set some arguments, ones you would normally pass to the roslaunch file in the cli.

Python code:

nodes = {}
rlf = os.path.join(roslib.packages.get_pkg_dir(self.backend_package), 'launch/{}'.format(self.backend_launch_filename))
rlc = ROSLaunchConfig()
rlxl = XmlLoader(resolve_anon=False)
rlxl.load(rlf, rlc, verbose=False)

for node in roslaunch.node_args.get_node_list(rlc):
    nodes[node] = roslaunch.node_args.get_node_args(node, [rlf])

for key in nodes:
    self.processes[key] = subprocess.Popen(nodes[key])
    print 'Launching {0} with PID {1}'.format(key, self.processes[key].pid)

Roslaunch file:

<?xml version="1.0"?>
<launch>
    <arg name="name" default="$(anon backend)" />
    <arg name="remoteip"   default="localhost" />

    <!-- name node (and topic) after parameter file -->
    <node name="$(arg name)" pkg="my_backend" type="backend" args="-i $(arg remoteip)" output="screen">
    <rosparam command="load" file="$(find my_backend)/launch/blacklist.yaml" />
    </node>
</launch>

You can see in the roslaunch file there is an arg for remoteip. Anyone have an idea how to set that value with my python implementation?

Thanks