ros2 launch ros2 launch ~/src/my_package/launch/my.launch.py my.launch.py : from launch import LaunchDescription from launch_ros.actions import Node def generate_launch_description(): return LaunchDescription([ Node( package='turtlesim', namespace='turtlesim1', executable='turtlesim_node', name='sim' ), Node( package='turtlesim', namespace='turtlesim2', executable='turtlesim_node', name='sim' ),..