详解Python利用BeautifulSoup模块搜索内容方法

这篇文章主要给大家介绍了python中 Beautiful Soup 模块的搜索方法函数。方法不同类型的过滤参数能够进行不同的过滤，得到想要的结果。文中介绍的非常详细，对大家具有一定的参考价值，需要的朋友们下面来一起看看吧。

<html>
<body>
<p class="ecopyramid">
 <ul id="producers">
 <li class="producerlist">
  <p class="name">plants</p>
  <p class="number">100000</p>
 </li>
 <li class="producerlist">
  <p class="name">algae</p>
  <p class="number">100000</p>
 </li>
 </ul>
 <ul id="primaryconsumers">
 <li class="primaryconsumerlist">
  <p class="name">deer</p>
  <p class="number">1000</p>
 </li>
 <li class="primaryconsumerlist">
  <p class="name">rabbit</p>
  <p class="number">2000</p>
 </li>
 </ul>
 <ul id="secondaryconsumers">
 <li class="secondaryconsumerlist">
  <p class="name">fox</p>
  <p class="number">100</p>
 </li>
 <li class="secondaryconsumerlist">
  <p class="name">bear</p>
  <p class="number">100</p>
 </li>
 </ul>
 <ul id="tertiaryconsumers">
 <li class="tertiaryconsumerlist">
  <p class="name">lion</p>
  <p class="number">80</p>
 </li>
 <li class="tertiaryconsumerlist">
  <p class="name">tiger</p>
  <p class="number">50</p>
 </li>
 </ul>
</p>
</body>
</html>

from bs4 import BeautifulSoup
with open('search.html','r') as filename:
 soup = BeautifulSoup(filename,'lxml')
first_ul_entries = soup.find('ul')
print first_ul_entries.li.p.string

tag_li = soup.find('li')
# tag_li = soup.find(name = "li")
print type(tag_li)
print tag_li.p.string

search_for_text = soup.find(text='plants')
print type(search_for_text)
<class 'bs4.element.NavigableString'>

<p>The below HTML has the information that has email ids.</p>
 abc@example测试数据 
<p>xyz@example测试数据</p> 
 <span>foo@example测试数据</span>

email_id_example = """
 <p>The below HTML has the information that has email ids.</p>
 abc@example测试数据
 <p>xyz@example测试数据</p>
 <span>foo@example测试数据</span>
 """
email_soup = BeautifulSoup(email_id_example,'lxml')
print email_soup
# pattern = "\w+@\w+\.\w+"
emailid_regexp = re测试数据pile("\w+@\w+\.\w+")
first_email_id = email_soup.find(text=emailid_regexp)
print first_email_id

search_for_attribute = soup.find(id='primaryconsumers')
print search_for_attribute.li.p.string

customattr = """
 <p data-custom="custom">custom attribute example</p>
   """
customsoup = BeautifulSoup(customattr,'lxml')
customsoup.find(data-custom="custom")
# SyntaxError: keyword can't be an expression

using_attrs = customsoup.find(attrs={'data-custom':'custom'})
print using_attrs

css_class = soup.find(attrs={'class':'producerlist'})
css_class2 = soup.find(class_ = "producerlist")
print css_class
print css_class2

def is_producers(tag):
 return tag.has_attr('id') and tag.get('id') == 'producers'
tag_producers = soup.find(is_producers)
print tag_producers.li.p.string

combine_html = """
 <p class="identical">
  Example of p tag with class identical
 </p>
 <p class="identical">
  Example of p tag with class identical
 <p>
 """
combine_soup = BeautifulSoup(combine_html,'lxml')
identical_p = combine_soup.find("p",class_="identical")
print identical_p

# 搜索所有 class 属性等于 tertiaryconsumerlist 的标签。
all_tertiaryconsumers = soup.find_all(class_='tertiaryconsumerlist')
print type(all_tertiaryconsumers)
for tertiaryconsumers in all_tertiaryconsumers:
 print tertiaryconsumers.p.string

# 搜索所有的 p 和 li 标签
p_li_tags = soup.find_all(["p","li"])
print p_li_tags
print
# 搜索所有类属性是 producerlist 和 primaryconsumerlist 的标签
all_css_class = soup.find_all(class_=["producerlist","primaryconsumerlist"])
print all_css_class
print

# 搜索 父标签
primaryconsumers = soup.find_all(class_='primaryconsumerlist')
print len(primaryconsumers)
# 取父标签的第一个
primaryconsumer = primaryconsumers[0]
# 搜索所有 ul 的父标签
parent_ul = primaryconsumer.find_parents('ul')
print len(parent_ul)
# 结果将包含父标签的所有内容
print parent_ul
print
# 搜索,取第一个出现的父标签.有两种操作
immediateprimary_consumer_parent = primaryconsumer.find_parent()
# immediateprimary_consumer_parent = primaryconsumer.find_parent('ul')
print immediateprimary_consumer_parent

producers = soup.find(id='producers')
next_siblings = producers.find_next_siblings()
print next_siblings

# 搜索下一级标签
first_p = soup.p
all_li_tags = first_p.find_all_next("li")
print all_li_tags

搜索上一个标签

与搜索下一个标签类似，使用 find_previous() 和 find_all_previous() 方法来搜索上一个标签。

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更新时间：2022-10-19 阅读：35次