Python爬虫之PyQuery使用

PyQuery简介

pyquery能够通过选择器精确定位 DOM 树中的目标并进行操作。pyquery相当于jQuery的python实现，可以用于解析HTML网页等。它的语法与jQuery几乎完全相同，对于使用过jQuery的人来说很熟悉，也很好上手。

初始化

有 4 种方法可以进行初始化：
可以通过传入 字符串、lxml、文件 或者 url 来使用PyQuery

from pyquery import PyQuery as pq

from lxml import etree

d = pq("<html></html>")#传入字符串

d = pq(etree.fromstring("<html></html>"))#传入lxml

d = pq(url='http://baidu.com/') #传入url

d = pq(filename=path_to_html_file) #传入文件

　　

基本CSS选择器

html='''

<html>

 <body>

  <ul class="mh-col">

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-1"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E6%AD%8C%E6%89%8B%E9%AB%98%E7%A9%BA%E6%8B%8DMV%E5%9D%A0%E4%BA%A1&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     歌手高空拍MV坠亡

    </a>

    <span class="mh-ico-up">

    </span>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-2"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E4%BD%9B%E7%A5%96%E6%9C%B1%E9%BE%99%E5%B9%BF%E9%87%91%E5%A9%9A&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D&fr=hao_360so_history_b" target="_blank">

     佛祖朱龙广金婚

    </a>

    <span class="mh-ico-down">

    </span>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-3"}' href="http://www.so.com/link?url=http%3A%2F%2Fbaike.so.com%2Fzt%2Fzufangfangpian.html%3Fsrc%3Dreci&q=%E5%91%A8%E6%9D%B0%E4%BC%A6%E7%9A%84%E6%AD%8C&ts=1540365398&t=c6890eee0e669832ca96d5223582d6e" target="_blank">

     常见租房陷阱

    </a>

    <span class="mh-ico-up">

    </span>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-4"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E9%9D%B3%E4%B8%9C%E5%9B%9E%E5%BA%94%E5%8F%91%E9%94%99%E8%AF%97%E8%AF%8D&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     靳东回应发错诗词

    </a>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-5"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E7%85%A4%E8%80%81%E6%9D%BF%E4%BB%AC%E7%9A%84%E5%BD%B1%E8%A7%86%E6%B1%9F%E6%B9%96&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     煤老板们的影视江湖

    </a>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-6"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=1024%E7%A8%8B%E5%BA%8F%E5%91%98%E8%8A%82&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     1024程序员节

    </a>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-7"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E7%BE%8E%E7%9A%84%E5%90%88%E5%B9%B6%E5%B0%8F%E5%A4%A9%E9%B9%85&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     美的合并小天鹅

    </a>

   </li>

   <li class="g-ellipsis">

    <a class="g-a-noline" data-md='{"b":"list","p":"1-8"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E4%BA%AC%E6%98%86%E9%AB%98%E9%80%9F4%E8%BD%A6%E7%9B%B8%E6%92%9E&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     京昆高速4车相撞

    </a>

   </li>

  </ul>

 </body>

</html>

'''

from pyquery import PyQuery as pq
doc = pq(html)

# 获取所有a标签
print(doc('body .mh-col li a'))





注意：
类名用. 
id用#
标签用标签名


另外选择的是具有层级关系，从左到右，不是直接的父子的关系。


运行结果如下：




<a class="g-a-noline" data-md="{"b":"list","p":"1-1"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E6%AD%8C%E6%89%8B%E9%AB%98%E7%A9%BA%E6%8B%8DMV%E5%9D%A0%E4%BA%A1&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     歌手高空拍MV坠亡

    </a>

    <a class="g-a-noline" data-md="{"b":"list","p":"1-2"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E4%BD%9B%E7%A5%96%E6%9C%B1%E9%BE%99%E5%B9%BF%E9%87%91%E5%A9%9A&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D&fr=hao_360so_history_b" target="_blank">

     佛祖朱龙广金婚

    </a>

    <a class="g-a-noline" data-md="{"b":"list","p":"1-3"}" href="http://www.so.com/link?url=http%3A%2F%2Fbaike.so.com%2Fzt%2Fzufangfangpian.html%3Fsrc%3Dreci&q=%E5%91%A8%E6%9D%B0%E4%BC%A6%E7%9A%84%E6%AD%8C&ts=1540365398&t=c6890eee0e669832ca96d5223582d6e" target="_blank">

     常见租房陷阱

    </a>

    <a class="g-a-noline" data-md="{"b":"list","p":"1-4"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E9%9D%B3%E4%B8%9C%E5%9B%9E%E5%BA%94%E5%8F%91%E9%94%99%E8%AF%97%E8%AF%8D&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     靳东回应发错诗词

    </a>

   <a class="g-a-noline" data-md="{"b":"list","p":"1-5"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E7%85%A4%E8%80%81%E6%9D%BF%E4%BB%AC%E7%9A%84%E5%BD%B1%E8%A7%86%E6%B1%9F%E6%B9%96&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     煤老板们的影视江湖

    </a>

   <a class="g-a-noline" data-md="{"b":"list","p":"1-6"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=1024%E7%A8%8B%E5%BA%8F%E5%91%98%E8%8A%82&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     1024程序员节

    </a>

   <a class="g-a-noline" data-md="{"b":"list","p":"1-7"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E7%BE%8E%E7%9A%84%E5%90%88%E5%B9%B6%E5%B0%8F%E5%A4%A9%E9%B9%85&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     美的合并小天鹅

    </a>

   <a class="g-a-noline" data-md="{"b":"list","p":"1-8"}" href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E4%BA%AC%E6%98%86%E9%AB%98%E9%80%9F4%E8%BD%A6%E7%9B%B8%E6%92%9E&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     京昆高速4车相撞

    </a>





　　


操作




html='''

<html>

 <body>

  <ul class="mh-col">

   <li class="g-ellipsis1">

    <a class="g-a-noline1" data-md='{"b":"list","p":"1-1"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E6%AD%8C%E6%89%8B%E9%AB%98%E7%A9%BA%E6%8B%8DMV%E5%9D%A0%E4%BA%A1&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     歌手高空拍MV坠亡

    </a>

    <span class="mh-ico-up">

    </span>

   </li>

   <li class="g-ellipsis2">

    <a class="g-a-noline2" data-md='{"b":"list","p":"1-2"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E4%BD%9B%E7%A5%96%E6%9C%B1%E9%BE%99%E5%B9%BF%E9%87%91%E5%A9%9A&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D&fr=hao_360so_history_b" target="_blank">

     佛祖朱龙广金婚

    </a>

    <span class="mh-ico-down">

    </span>

   </li>

   <li class="g-ellipsis3">

    <a class="g-a-noline3" data-md='{"b":"list","p":"1-3"}' href="http://www.so.com/link?url=http%3A%2F%2Fbaike.so.com%2Fzt%2Fzufangfangpian.html%3Fsrc%3Dreci&q=%E5%91%A8%E6%9D%B0%E4%BC%A6%E7%9A%84%E6%AD%8C&ts=1540365398&t=c6890eee0e669832ca96d5223582d6e" target="_blank">

     常见租房陷阱

    </a>

    <span class="mh-ico-up">

    </span>

   </li>

   <li class="g-ellipsis4">

    <a class="g-a-noline4" data-md='{"b":"list","p":"1-4"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E9%9D%B3%E4%B8%9C%E5%9B%9E%E5%BA%94%E5%8F%91%E9%94%99%E8%AF%97%E8%AF%8D&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     靳东回应发错诗词

    </a>

   </li>

   <li class="g-ellipsis5">

    <a class="g-a-noline5" data-md='{"b":"list","p":"1-5"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E7%85%A4%E8%80%81%E6%9D%BF%E4%BB%AC%E7%9A%84%E5%BD%B1%E8%A7%86%E6%B1%9F%E6%B9%96&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     煤老板们的影视江湖

    </a>

   </li>

   <li class="g-ellipsis6">

    <a class="g-a-noline6" data-md='{"b":"list","p":"1-6"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=1024%E7%A8%8B%E5%BA%8F%E5%91%98%E8%8A%82&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     1024程序员节

    </a>

   </li>

   <li class="g-ellipsis7">

    <a class="g-a-noline7" data-md='{"b":"list","p":"1-7"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E7%BE%8E%E7%9A%84%E5%90%88%E5%B9%B6%E5%B0%8F%E5%A4%A9%E9%B9%85&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     美的合并小天鹅

    </a>

   </li>

   <li class="g-ellipsis8">

    <a class="g-a-noline8" data-md='{"b":"list","p":"1-8"}' href="https://www.so.com/s?ie=utf-8&src=know_side_nlp_sohot&q=%E4%BA%AC%E6%98%86%E9%AB%98%E9%80%9F4%E8%BD%A6%E7%9B%B8%E6%92%9E&ob_ext=%7B%22rsv_cq%22%3A%22%5Cu5468%5Cu6770%5Cu4f26%5Cu7684%5Cu6b4c%22%2C%22rt%22%3A%22%5Cu5b9e%5Cu65f6%5Cu70ed%5Cu641c%22%2C%22rclken%22%3Anull%7D" target="_blank">

     <p>新闻</p>

     京昆高速4车相撞

    </a>

   </li>

  </ul>

 </body>

</html>

'''

from pyquery import PyQuery as pq

doc = pq(html)

items = doc('.mh-col')

#.find()：查找嵌套元素

alist = items.find('li a')

print(alist)


#查找所有子元素

alist2 = items.children()

print(alist2)

#查找指定的子元素

alist3 = items.children('.g-ellipsis1')
print(alist2) 



#查找父元素 
#注意：一个元素只有一个父元素 
body = items.parent() 
print(body) 

#查找祖先元素 
content = items.parents() 
print(content) 

#查找兄弟元素 
li = doc('.mh-col .g-ellipsis1') 
print(li.siblings()) 

#遍历 单个元素 
#遍历所有的a标签
alist =doc('.mh-col li a').items() 
　　for a in alist: print(a)




　　


获取信息




获取属性

a =doc('.mh-col li .g-a-noline8')

print(a.attr['href'])

print(a.attr.href)

获取文本

a =doc('.mh-col li .g-a-noline8')

print(a.text())

获取HTML

a =doc('.mh-col li .g-a-noline8')

print(a.html())





　


简单的DOM操作




#addClass、removerClass
#修改类名

a =doc('.mh-col li .g-a-noline8')

print(a)

a.removeClass('g-a-noline8')

print(a)

a.addClass('g-a-noline8')

print(a)

#attr、css
#修改属性和样式

a =doc('.mh-col li .g-a-noline8')

print(a)

a.attr('name','link')

print(a)

a.css('font-size','14px')

print(a)



#remove
#删除标签
li = doc('.mh-col .g-ellipsis8')
print(li)
li.find('a').remove()
print(li)




　　


更多的DOM操作：https://pyquery.readthedocs.io/en/latest/api.html
												


											
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