code: def patch_default_retcodes():
      
      import luigi.retcodes
  
      retcode = luigi.retcodes.retcode
  
      retcode.already_running._default = 10
      retcode.missing_data._default = 20
      retcode.not_run._default = 30
      retcode.task_failed._default = 40
      retcode.scheduling_error._default = 50
      retcode.unhandled_exception._default = 60
docs: Sets the default luigi return codes in ``luigi.retcodes.retcode`` to:
  
          - already_running: 10
          - missing_data: 20
          - not_run: 30
          - task_failed: 40
          - scheduling_error: 50
          - unhandled_exception: 60