old_contents: __author__ = 'weijia'
  
  
  INSTALLED_APPS += (
      'mptt',
      'obj_sys',
  )
  
new_contents: __author__ = 'weijia'
  
  
  INSTALLED_APPS += (
      'mptt',
      'tagging',
      'obj_sys',
      # "obj_sys.apps.ObjSysConfig",
  )
  
subject: Update default settings.