You only need to get it right once, and from then on the compiler will catch any mistakes if you use it incorrectly. In contrast, every time you write obj.get_a

You only need to get it right once, and from then on the compiler will catch any mistakes if you use it incorrectly. In contrast, every time you write obj.get_attr("DesiredSpeed"), there's a chance you'll make a typo and the compiler won't warn you about it.