Enabled Colliders will collide with other colliders, disabled Colliders won't.
This is shown as the small checkbox in the inspector of the Colliders.
collider.enabled = false;
using UnityEngine;
using System.Collections;
public class example : MonoBehaviour {
void Example() {
collider.enabled = false;
}
}
import UnityEngine
import System.Collections
class example(MonoBehaviour):
def Example():
collider.enabled = false