怎么从 <ul data-target="area"> <li data-id="0" data-type="bizcircle" class="filter__item--level3 filter__item--aside strong"> <a href="/zufang/yizhuangkaifaqu/rt200600000001/">不限</a> </li> <li class="filter__item--title">d</li> <li data-id="611100395" data-type="bizcircle" class="filter__item--level3 "> <a href="/zufang/daxingqita11/rt200600000001/">大兴其它</a> </li> <li class="filter__item--title">m</li> <li data-id="18335778" data-type="bizcircle" class="filter__item--level3 "> <a href="/zufang/majuqiao1/rt200600000001/">马驹桥</a> </li> <li class="filter__item--title">t</li> <li data-id="611100405" data-type="bizcircle" class="filter__item--level3 "> <a href="/zufang/tongzhouqita11/rt200600000001/">通州其它</a> </li> <li class="filter__item--title">y</li> <li data-id="18335750" data-type="bizcircle" class="filter__item--level3 "> <a href="/zufang/yizhuang1/rt200600000001/">亦庄</a> </li> <li data-id="611100595" data-type="bizcircle" class="filter__item--level3 "> <a href="/zufang/yizhuangkaifaquqita1/rt200600000001/">亦庄开发区其它</a> </li> </ul> 这段代码中把href属性值全部提取出来

可以使用BeautifulSoup库来解析HTML代码，并使用find_all方法选取所有的a标签，再从中提取href属性值。

例如，假设HTML代码如下：

<ul data-target="area">
    <li data-id="0" data-type="bizcircle" class="filter__item--level3 filter__item--aside strong">
        <a href="/zufang/yizhuangkaifaqu/rt200600000001/">不限</a>
    </li>
    <li class="filter__item--title">d</li>
    <li data-id="611100395" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/daxingqita11/rt200600000001/">大兴其它</a>
    </li>
    <li class="filter__item--title">m</li>
    <li data-id="18335778" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/majuqiao1/rt200600000001/">马驹桥</a>
    </li>
    <li class="filter__item--title">t</li>
    <li data-id="611100405" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/tongzhouqita11/rt200600000001/">通州其它</a>
    </li>
    <li class="filter__item--title">y</li>
    <li data-id="18335750" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/yizhuang1/rt200600000001/">亦庄</a>
    </li>
    <li data-id="611100595" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/yizhuangkaifaquqita1/rt200600000001/">亦庄开发区其它</a>
    </li>
</ul>

要获取所有a标签的href属性值，可以使用以下代码：

from bs4 import BeautifulSoup

html = '''
<ul data-target="area">
    <li data-id="0" data-type="bizcircle" class="filter__item--level3 filter__item--aside strong">
        <a href="/zufang/yizhuangkaifaqu/rt200600000001/">不限</a>
    </li>
    <li class="filter__item--title">d</li>
    <li data-id="611100395" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/daxingqita11/rt200600000001/">大兴其它</a>
    </li>
    <li class="filter__item--title">m</li>
    <li data-id="18335778" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/majuqiao1/rt200600000001/">马驹桥</a>
    </li>
    <li class="filter__item--title">t</li>
    <li data-id="611100405" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/tongzhouqita11/rt200600000001/">通州其它</a>
    </li>
    <li class="filter__item--title">y</li>
    <li data-id="18335750" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/yizhuang1/rt200600000001/">亦庄</a>
    </li>
    <li data-id="611100595" data-type="bizcircle" class="filter__item--level3  ">
        <a href="/zufang/yizhuangkaifaquqita1/rt200600000001/">亦庄开发区其它</a>
    </li>
</ul>
'''

soup = BeautifulSoup(html, 'html.parser')
as_ = soup.find_all('a')

for a in as_:
    href = a['href']
    print(href)

输出结果为：

/zufang/yizhuangkaifaqu/rt200600000001/
/zufang/daxingqita11/rt200600000001/
/zufang/majuqiao1/rt200600000001/
/zufang/tongzhouqita11/rt200600000001/
/zufang/yizhuang1/rt200600000001/
/zufang/yizhuangkaifaquqita1/rt200600000001/

其中，find_all方法用来选取所有匹配的元素，参数为标签名称字符串。在这里，我们选取所有的a标签，并遍历每个a标签。然后，从每个a标签中提取href属性值，并将所有的href属性值打印出来。