def display_output(screen):
    """
    Display the menu list of gunicorns.
    """
    format_row() # Sets up the screen width.
    screen_height = len(gunicorns) + len(instructions.split("\n")) + 9
    if not gunicorns:
        screen_height += 2 # A couple of blank lines are added when empty.
    screen.erase()
    win = curses.newwin(screen_height, screen_width + 6, 1, 3)
    win.bkgd(" ", curses.color_pair(1))
    win.border()
    x = 3
    blank_line = y = count(2).next
    win.addstr(y(), x, title.center(screen_width), curses.A_NORMAL)
    blank_line()
    win.addstr(y(), x, format_row(" PID", "PORT", "NAME", "MEM (MB)", "WORKERS"),
        curses.A_STANDOUT)
    if not gunicorns:
        blank_line()
        win.addstr(y(), x, no_gunicorns.center(screen_width),
            curses.A_NORMAL)
        blank_line()
    else:
        win.hline(y(), x, curses.ACS_HLINE, screen_width)
        for (i, pid) in enumerate(sorted(gunicorns.keys())):
            port = gunicorns[pid]["port"]
            name = gunicorns[pid]["name"]
            mem = "%#.3f" % (1000. / gunicorns[pid]["mem"])
            workers = gunicorns[pid]["workers"]
            # When a signal is sent to update the number of workers, the number
            # of workers is set to zero as a marker to signify an update has
            # occurred. We then piggyback this variable and use it as a counter
            # to animate the display until the gunicorn is next updated.
            if workers < 1:
                gunicorns[pid]["workers"] -= 1
                chars = "|/-\\"
                workers *= -1
                if workers == len(chars):
                   gunicorns[pid]["workers"] = workers = 0
                workers = chars[workers]
            if pid == selected_pid:
                attr = curses.A_STANDOUT
                prefix_char = '> '
            else:
                attr = curses.A_NORMAL
                prefix_char = '  '
            win.addstr(y(), x, format_row(pid, port, name, mem, workers,
                                          prefix_char), attr)
    win.hline(y(), x, curses.ACS_HLINE, screen_width)
    blank_line()
    for line in instructions.split("\n"):
        win.addstr(y(), x, line.center(screen_width), curses.A_NORMAL)
    win.refresh()
dataset/ETHPy150Open stephenmcd/gunicorn-console/gunicorn_console.py/display_output/swapped operands of `/`