0) Understands programming is problem solving. The better you get at solving problems in general, the better programmer you will be.

1) A beautiful mind. An ability to quickly, clearly understand how the data in the system is interacting with each other.

2) Hobbyist – solves problems of all kinds in his spare time. Learns to apply the different ways

3) Loves to develop software – Painters love painting, writers love writing, musicians love making music..

4) Constant learner – never knows enough. Instead of “I don’t know”, the first thought in their mind is “I want to know how”.

I would probably add to this list that the most important thing is the right attitude, in addition to the ability.