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It is possible! I am using something like the following code in my rostests to setup the node environment if necessary.

import roslaunch
package = 'PACKACKE_NAME'
executable = 'YOUR_SCRIPT.py'
node_name = 'YOUR_NODE_NAME'
node = roslaunch.core.Node(package=package, node_type=executable, name=node_name)
launch = roslaunch.scriptapi.ROSLaunch()
launch.start() 
process = launch.launch(node)

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