def ec2_add_priv_launch_key(argument_table, operation_model, session,
                            **kwargs):
    argument_table['priv-launch-key'] = LaunchKeyArgument(session,
                                                          operation_model,
                                                          'priv-launch-key')
This handler gets called after the argument table for the
dataset/ETHPy150Open aws/aws-cli/awscli/customizations/ec2decryptpassword.py/ec2_add_priv_launch_key