code: def link(self, camera):
          
          cam1, cam2 = self, camera
          # Remove if already linked
          while cam1 in cam2._linked_cameras:
              cam2._linked_cameras.remove(cam1)
          while cam2 in cam1._linked_cameras:
              cam1._linked_cameras.remove(cam2)
          # Link both ways
          cam1._linked_cameras.append(cam2)
          cam2._linked_cameras.append(cam1)
docs: Link this camera with another camera of the same type
  
          Linked camera's keep each-others' state in sync.
  
          Parameters
          ----------
          camera : instance of Camera
              The other camera to link.