basic_controller_example.launch

<launch>

    <arg name="robot_name" default="sam"/>
    
    <group>
    <push-ros-namespace namespace="$(var robot_name)"/>
            <!-- Notice that exec= part was defined in setup.py under entry_points!  -->
            <node name="pid_controller_node" pkg="ros2_python_examples" exec="example_node" output="screen">
                <!-- no params for this node-->
            </node>
    </group>

</launch>