code: def err(msg, *args, **kw):
      # type: (str, *Any, **Any) -> None
      
      if len(args) or len(kw):
          msg = msg.format(*args, **kw)
  
      shell.cprint('-- <31>{}<0>'.format(msg))
docs: Per step status messages
  
      Use this locally in a command definition to highlight more important
      information.