var rect = Rect (0, 0, 100, 100);
print(rect.center);
rect.center = new Vector2 (10, 10);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Rect rect = new Rect(0, 0, 100, 100);
    void Example() {
        print(rect.center);
        rect.center = new Vector2(10, 10);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public rect as Rect = Rect(0, 0, 100, 100)

    def Example():
        print(rect.center)
        rect.center = Vector2(10, 10)