parameters: (self, args, screen_info=None)
docstring: Command handler for "help".
  
      "help" is a common command that merits built-in support from this class.
  
      Args:
        args: Command line arguments to "help" (not including "help" itself).
        screen_info: (dict) Information regarding the screen, e.g., the screen
          width in characters: {"cols": 80}
  
      Returns:
        (RichTextLines) Screen text output.
docstring_summary: Command handler for "help".
docstring_tokens: Command handler for help .
function: def _help_handler(self, args, screen_info=None):
      """Command handler for "help".
  
      "help" is a common command that merits built-in support from this class.
  
      Args:
        args: Command line arguments to "help" (not including "help" itself).
        screen_info: (dict) Information regarding the screen, e.g., the screen
          width in characters: {"cols": 80}
  
      Returns:
        (RichTextLines) Screen text output.
      """
  
      _ = screen_info  # Unused currently.
  
      if not args:
        return self.get_help()
      elif len(args) == 1:
        return self.get_help(args[0])
      else:
        return RichTextLines(["ERROR: help takes only 0 or 1 input argument."])
function_tokens: def _help_handler ( self , args , screen_info = None ) : _ = screen_info # Unused currently. if not args : return self . get_help ( ) elif len ( args ) == 1 : return self . get_help ( args [ 0 ] ) else : return RichTextLines ( [ "ERROR: help takes only 0 or 1 input argument." ] )