请教如何用pyquery循环取出<ul>第一个<li>标签中的女装及嵌套<ul><li>标签对应的href，后面的2、3依次类推~！

<ul class="cat-list">
    <li><a href="" title="">女装</a></li>
    <ul class="txt-list-brand clear none">
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
     </ul>
     
    <li><a href="" title="">男装</a></li>
    <ul class="txt-list-brand clear none">
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
     </ul>
     
     <li><a href="" title="">女鞋</a></li>
    <ul class="txt-list-brand clear none">
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
        <li><a target="_blank" href="http://xxxx.com/" title="xxx">xxx</a></li>
     </ul>
     
</ul>