如何在beautifulsoup中按顺序打印标签的内容？

Question

我正在尝试从下面发布的 html 页面中获取文本。我尝试了 for 循环，但它没有按顺序打印字符串。我需要按如下顺序打印字符串：

            text1:text_1.1
            text2:text2.2,2.2
            ...

我需要得到上面打印的输出。

<ul> 
   <li>
    <b>text1:</b>
    <a><a href="search.php?origin=">text_1.1</a>
    </li>
   <li>
    <b>text2</b>
    <a href="search.php?origin=">text_2.1</a>
    <a href="search.php?origin">text_2.2</a>
   </li>
   <li>
    <b>text4</b>
    <a href="search.php?origin=">text_4.1</a>
    <a href="search.php?origin=">text_4.2</a>
    <a href="search.php?origin=">text_4.3</a>
    <a href="search.php?origin=">text_4.4</a>
   </li>
   <li>
    <b>text5</b>
     <a href="search.php?origin=">text5.1</a>
   </li>
    <li>
    <b>text6</b>
    <a href="search.php?origin=">text6.1</a>
    <a href="search.php?origin=">text6.2</a>
    <a href="search.php?origin=">text6.3</a>
   <li>
    <b>text7</b>
    <a href="search.php?origin=">text7.1</a>
    <font color="green">text7.2</font>          
    </li>
   <li>
    <b>text8</b>
    <a href="dwres.php?resource=">2 </a>
  </ul>

Answer 1

查找所有<li> 元素，以便您可以按<b> 标签对它们的内容进行分组。您可能需要字典来映射它们，但为了保留文档顺序，您可能可以使用 collections.OrderedDict() 对象：

from collections import OrderedDict

results = OrderedDict()

for li in soup.find_all('li'):
    bold = li.b
    if bold is None:
        continue
    results[bold.get_text(strip=True)] = [
        link.get_text(strip=True) for link in li.find_all('a')
    ]

演示：

>>> from bs4 import BeautifulSoup
>>> from collections import OrderedDict
>>> soup = BeautifulSoup('''\
...     <ul> 
...        <li>
...         <b>text1:</b>
...         <a><a href="search.php?origin=">text_1.1</a>
...         </li>
...        <li>
...         <b>text2</b>
...         <a href="search.php?origin=">text_2.1</a>
...         <a href="search.php?origin">text_2.2</a>
...        </li>
...        <li>
...         <b>text4</b>
...         <a href="search.php?origin=">text_4.1</a>
...         <a href="search.php?origin=">text_4.2</a>
...         <a href="search.php?origin=">text_4.3</a>
...         <a href="search.php?origin=">text_4.4</a>
...        </li>
...        <li>
...         <b>text5</b>
...          <a href="search.php?origin=">text5.1</a>
...        </li>
...         <li>
...         <b>text6</b>
...         <a href="search.php?origin=">text6.1</a>
...         <a href="search.php?origin=">text6.2</a>
...         <a href="search.php?origin=">text6.3</a>
...        <li>
...         <b>text7</b>
...         <a href="search.php?origin=">text7.1</a>
...         <font color="green">text7.2</font>          
...         </li>
...        <li>
...         <b>text8</b>
...         <a href="dwres.php?resource=">2 </a>
...       </ul>
... ''')
>>> results = OrderedDict()
>>> for li in soup.find_all('li'):
...     bold = li.b
...     if bold is None:
...         continue
...     results[bold.get_text(strip=True)] = [
...         link.get_text(strip=True) for link in li.find_all('a')
...     ]
... 
>>> results
OrderedDict([(u'text1:', [u'', u'text_1.1']), (u'text2', [u'text_2.1', u'text_2.2']), (u'text4', [u'text_4.1', u'text_4.2', u'text_4.3', u'text_4.4']), (u'text5', [u'text5.1']), (u'text6', [u'text6.1', u'text6.2', u'text6.3']), (u'text7', [u'text7.1']), (u'text8', [u'2'])])
>>> for key, elems in results.items():
...     print '{}: {}'.format(key, ', '.join(elems))
... 
text1:: , text_1.1
text2: text_2.1, text_2.2
text4: text_4.1, text_4.2, text_4.3, text_4.4
text5: text5.1
text6: text6.1, text6.2, text6.3
text7: text7.1
text8: 2

print 可以集成到循环中，但是通过构建字典，您现在可以进行进一步处理；将其写入文件，将其发送到其他地方，等等。

Answer 2

from bs4 import BeautifulSoup

for t in BeautifulSoup(html).find("ul").find_all("a"):
    print(t.text)

输出：

text_1.1
text_2.1
text_2.2
text_4.1
text_4.2
text_4.3
text_4.4
text5.1
text6.1
text6.2
text6.3
text7.1

如果你想要 a 和 b 标记文本：

ul = BeautifulSoup(html).find("ul")
b=  [b.text for  b in ul.find_all("b")]
a = [a.text for  a in ul.find_all("a")]

你需要决定你希望输出如何匹配你，因为显然 a 标签比 b 多。

您还可以获取 li 标签并使用 join 访问 a 和 b 标签，以在某种程度上接近您想要的：

ul = BeautifulSoup(html).find("ul")
li = ul.find_all("li")

for ele in li:
    print("{}:{}".format(ele.b.text,"".join([a.text for a in ele.find_all("a")])))
text1::text_1.1
text2:text_2.1text_2.2
text4:text_4.1text_4.2text_4.3text_4.4
text5:text5.1
text6:text6.1text6.2text6.3
text7:text7.1
text8:2