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In order to completely answer the question(to launch two nodes with the respective command line arguments), This is how my launch file looks now,

<launch>
 <arg name="args1"/>
 <arg name="args2"/>
 <node pkg="pkg" type="node.py" name="executable" output="screen" args="$(arg args1)"/>
 <node pkg="pkg" type="node1" name="executable1" output="screen" args="$(arg args2)"/> 
</launch>

and the command I enter in bash

rosrun pkg launch_file.launch args1:="a b c" args2:="a1 b1"