blender iterate over selected items and perform an action

iterate.py

// code meant to be run on the python console 
//blender iterate over selected items and perform an action
//  in this case increase the resolution of a curve and extrude by a certain ammount

for nr, obj in enumerate(bpy.context.selected_objects):
  obj.data.render_resolution_u = 24
  obj.data.extrude = 0.006