python(html; 同页面菜单内容分开)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .hide{
            display: none;
        }
        .menu{
            height: 38px;
            background-color: #115599;
            line-height: 38px;
            padding: 0 5px;
        }
        /*<!--active为选中时背景颜色的变色-->*/
        .active{
            background-color: red;
        }
        .menu .menu-item{
            float: left;
            border-right: 1px solid red;
            cursor: pointer;
        }
        /*cursor: pointer;为鼠标在菜单时。鼠标变为其他图标*/
        .content{
            min-height: 50px;
            border: 1px solid darkblue;
        }
    </style>
</head>
<body>
    <div style="width: 700px;margin: 0 auto">
        <div class="menu">
            <div class="menu-item active" a="1">菜单一</div>
            <!--active为选中时背景颜色的变色-->
            <div class="menu-item" a="2">菜单2</div>
            <div class="menu-item" a="3">菜单3</div>
        </div>
        <div class="content">
            <div b="1">nr1</div>
            <div class="hide" b="2">nr2</div>
            <div class="hide" b="3">nr3</div>
        </div>
    </div>
    <script src="jquery-1.12.4.js"></script>
    <script>
        $('.menu-item').click(function(){
            $(this).addClass('active').siblings().removeClass('active');
            var target = $(this).attr('a');
            $('.content').children("[b='"+ target+"']").removeClass('hide').siblings().addClass('hide');
        });
    </script>
</body>
</html>