code: def help(ctx, topic, **kw):
      
      # The help command implementation is taken from
      # https://www.burgundywall.com/post/having-click-help-subcommand
      if topic is None:
          click.echo(ctx.parent.get_help())
      else:
          click.echo(main.commands[topic].get_help(ctx))
docs: Show help for any command.