前往小程序,Get更优阅读体验!
立即前往
首页
学习
活动
专区
工具
TVP
发布
社区首页 >专栏 >PyQuery笔记

PyQuery笔记

作者头像
全栈程序员站长
发布2022-08-11 21:14:23
2030
发布2022-08-11 21:14:23
举报

大家好,又见面了,我是你们的朋友全栈君。

1、初始化

1.1、字符串初始化

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div>
    <ul>
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''

doc = py(html)
print(doc('li'))

1.2、URL初始化

代码语言:javascript
复制
from pyquery import PyQuery as py

# 通过URL来获取
doc = py(url='http://www.baidu.com')
# <class 'pyquery.pyquery.PyQuery'>
print(type(doc('title')))
# 输出选中的head标签
print(doc('head'))

1.3、文件的初始化

代码语言:javascript
复制
from pyquery import PyQuery as py

# 通过文件来获取
doc = py(filename='demo1.html')
# <class 'pyquery.pyquery.PyQuery'>
print(type(doc('li')))
# 输出所有的li标签
print(doc('li'))

2、基本的CSS选择器

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''

doc = py(html)
# 选中id为container中的class为list中的li标签
print(doc('#container .list li'))

3、查找元素

3.1、子元素

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
# 获取class为list的元素
items = doc('.list')
# <class 'pyquery.pyquery.PyQuery'>
print(type(items))
print(items)
# 在先前找到的元素中获取li标签
lis = items.find('li')
# <class 'pyquery.pyquery.PyQuery'>
print(type(lis))
print(lis)
# 获取先前找到的元素中的所有子元素
lis2 = items.children()
print(type(lis2))
print(lis2)
# 获取先前找到的元素中的class为active的元素
li3 = items.children('.active')
print(li3)

3.2、父元素

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
# 获取class为list的元素
items = doc('.list')
# 获取所选元素的父元素
container = items.parent()
print(type(container))
print(container)
print("==========================")
# 获取所选元素的所有父元素
parents = items.parents()
print(type(parents))
print(parents)
print("==========================")
# 获取所选元素的所有父元素中class为container的元素
parent = items.parents('.container')
print(parent)

3.3、兄弟元素

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
# 获取class为list的元素
items = doc('.list')
li = doc('.list .item-0.active')
# 查找选中元素的所有兄弟元素(不包含自己)
print(li.siblings())
# 查找选中元素的所有兄弟元素中class为active的元素(不包含自己)
print(li.siblings('.active'))

4、遍历

4.1、单个元素

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)

# 选中单个单个元素
li = doc('.item-0.active')
print(li)

4.2、多个元素

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)

# 查找所有li标签
lis = doc('li').items()
# <class 'generator'>
print(type(lis))
forli inlis:
    print(li)

5、获取信息

5.1、获取属性

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
a = doc('.item-0.active a')
# <a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a>
print(a)
# link3.html    获取选中标签的href属性
print(a.attr('href'))
# link3.html
print(a.attr.href)

5.2、获取文本

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
a = doc('.item-0.active a')
# <a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a>
print(a)
# 获取a标签的内容
print(a.text())

5.3、获取HTML

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
li = doc('.item-1.active')
# <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
print(li)
# 获取li标签的HTML
print(li.html())

6、DOM操作

6.1、addClass、removeClass

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
li = doc('.item-0.active')
print(li)
# 移除class
li.removeClass('active')
print(li)
# 添加class
li.addClass('active')
print(li)

6.2、attr、css

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div id="container">
    <ul class="list">
         <li class="item-0">first item</li>
         <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
         <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
         <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
         <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
     </ul>
 </div>
'''
doc = py(html)
li = doc('.item-0.active')
print(li)
# 添加name属性
li.attr('name', 'link')
print(li)
# 添加css样式
li.css('font-size', '14px')
print(li)

6.3、remove

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div class="wrap">
    Hello, World
    <p>This is a paragraph.</p>
 </div>
'''
doc = py(html)
wrap = doc('.wrap')
print(wrap.text())
# 在选择的元素中找到p标签并移除
wrap.find('p').remove()
print(wrap.text())

6.4、其他DOM方法

http://pyquery.readthedocs.io/en/latest/api.html


7、伪类选择器

代码语言:javascript
复制
from pyquery import PyQuery as py

html = '''
<div class="wrap">
    <div id="container">
        <ul class="list">
             <li class="item-0">first item</li>
             <li class="item-1"><a href="https://ask.hellobi.com/link2.html">second item</a></li>
             <li class="item-0 active"><a href="https://ask.hellobi.com/link3.html"><span class="bold">third item</span></a></li>
             <li class="item-1 active"><a href="https://ask.hellobi.com/link4.html">fourth item</a></li>
             <li class="item-0"><a href="https://ask.hellobi.com/link5.html">fifth item</a></li>
         </ul>
     </div>
 </div>
'''

doc = py(html)
# 找到第一个li
li = doc('li:first-child')
print(li)
# 找到最后一个li
li = doc('li:last-child')
print(li)
# 找到第二个li
li = doc('li:nth-child(2)')
print(li)
# 找到第三个到最后的li
li = doc('li:gt(2)')
print(li)
# 找到第偶数个li
li = doc('li:nth-child(2n)')
print(li)
# 找到内容包含second的li
li = doc('li:contains(second)')
print(li)

更多的选择器 http://www.w3school.com.cn/css/index.asp


8、官方文档

http://pyquery.readthedocs.io/

发布者:全栈程序员栈长,转载请注明出处:https://javaforall.cn/131346.html原文链接:https://javaforall.cn

本文参与 腾讯云自媒体同步曝光计划,分享自作者个人站点/博客。
原始发表:2022年4月2,如有侵权请联系 cloudcommunity@tencent.com 删除

本文分享自 作者个人站点/博客 前往查看

如有侵权,请联系 cloudcommunity@tencent.com 删除。

本文参与 腾讯云自媒体同步曝光计划  ,欢迎热爱写作的你一起参与!

评论
登录后参与评论
0 条评论
热度
最新
推荐阅读
目录
  • 1、初始化
    • 1.1、字符串初始化
      • 1.2、URL初始化
        • 1.3、文件的初始化
        • 2、基本的CSS选择器
        • 3、查找元素
          • 3.1、子元素
            • 3.2、父元素
              • 3.3、兄弟元素
              • 4、遍历
                • 4.1、单个元素
                  • 4.2、多个元素
                  • 5、获取信息
                    • 5.1、获取属性
                      • 5.2、获取文本
                        • 5.3、获取HTML
                        • 6、DOM操作
                          • 6.1、addClass、removeClass
                            • 6.2、attr、css
                              • 6.3、remove
                                • 6.4、其他DOM方法
                                • 7、伪类选择器
                                • 8、官方文档
                                领券
                                问题归档专栏文章快讯文章归档关键词归档开发者手册归档开发者手册 Section 归档