How to import sr_robot_msgs in Python

#!/usr/bin/env python

import roslib; roslib.load_manifest('rospy_tutorials')

import rospy
from std_msgs.msg import *
from stacks.shadow_robot.sr_robot_msgs.msg import JointControllerState

def callback(data):
    rospy.loginfo(rospy.get_caller_id()+"I heard %s", data)
    
def listener():

    rospy.init_node('listener', anonymous=True)

    rospy.Subscriber("sh_ffj3_mixed_position_velocity_controller/command", JointControllerState, callback)

    # spin() simply keeps python from exiting until this node is stopped
    rospy.spin()
        
if __name__ == '__main__':
    listener()

Traceback (most recent call last):
  File "/home/paulo/ros_workspace/sandbox/beginner_tutorials/scripts/listener.py", line 7, in 
    from stacks.shadow_robot.sr_robot_msgs.msg import JointControllerState
ImportError: No module named stacks.shadow_robot.sr_robot_msgs.msg