Reset Gazebo world to restore initial position

gazebo.py

import rospy

from std_srvs.srv import Empty


def reset_world():
    """
    Reset Gazebo world to restore initial position
    """
    rospy.wait_for_service('/gazebo/reset_world')
    try:
        cmd = rospy.ServiceProxy('/gazebo/reset_world', Empty)
        cmd()
    except rospy.ServiceException as e:
        print("Service call failed: %s" % e)