Accessing and assigning superclass variables.

I'm a tad bit used to Python, so this is a little difficult for me. I'm trying to create a subclass and reassign some default variables. While it's not impossible to do this in the "Awake" function, its likely I may need to set them before the awake function, so I can accurately collect a list of scripts with the proper IDs set on them.

 #pragma strict

class Skill extends MonoBehaviour{ var trained:boolean = false;

 var focus:boolean = false;
 
 @HideInInspector
 var _relevantModifier:Stats = Stats.INT;
 @HideInInspector
 var _trainedOnly:boolean = false;
 
 @HideInInspector
 var _skillID:SkillID; //Not entirely sure if this is a good idea.

}

And the sublcass:

 class Acrobatics extends Skill{
     _skillID  = SkillID.Acrobatics;
 }

What I end up getting is a compiling error which says "expecting }, found '_skillID'".

Is there a better way to do what I'm trying to do?