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<launch>

<arg name="source_list" default="[a_topic,a_second_topic]"/>

<node>

     <rosparam param="source_list" subst_value="True">$(arg source_list)</rosparam> 

</node>

</launch>

~~<launch>~~

<arg name="source_list" default="[a_topic,a_second_topic]"/>This:

<node>
<launch>
  <arg name="source_list" default="[a_topic,a_second_topic]"/>
     <node ...>

         <rosparam param="source_list" subst_value="True">$(arg source_list)</rosparam> 

</node>

</launch>

</node> </launch>

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