爬虫之pyquery库
官方文档：https://pyquery.readthedocs.io/en/latest/
PyQuery是一个强大又灵活的网页解析库。如果你觉得正则写起来太麻烦、BeautifulSoup语法太难记，而你熟悉jQury的语法，那么PyQuery就是你的绝佳选择。
一、开始
字符串初始化：
from pyquery import PyQuery as pq
d = pq("<html>哈哈哈</html>") # 现在d就相当于jQuery的$
print(d("html"))
URL初始化：
from pyquery import PyQuery as pq
d = pq(url="https://www.baidu.com")
print(d("head"))
文件初始化：
from pyquery import PyQuery as pq
d = pq(filename='demo.html') # filename指定文件路径
print(d("head"))
二、基本CSS选择器
html = """
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
print(d("#container .list li"))
三、查找元素
子元素
d("css选择器").find("li")
html = """
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
items = d(".list")
print(type(items)) # <class 'pyquery.pyquery.PyQuery'>
li = items.find("li")
print(type(li)) # <class 'pyquery.pyquery.PyQuery'>
print(li)
"""
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
"""
父元素
d("css选择器").parent(<css选择器(可无)>)
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
items = d(".list")
parents = items.parents()
print(parents)
"""
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
"""
d(".list").parents()
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
items = d(".list")
parents = items.parents(".wrap")
print(parents)
"""
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
d(".list").parents(".wrap")
兄弟元素
d("css选择器").siblings(<css选择器(可无)>)
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d(".list .item-0.active")
print(li.siblings())
"""
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0">first item</li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
"""
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d(".list .item-0.active")
print(li.siblings(".active"))
"""
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
"""
四、遍历
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d("li").items()
print(type(li)) # <class 'generator'>
for i in li:
print(i)
"""
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
"""
五、获取信息
获取属性
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
a = d(".item-0.active a")
print(a.attr("href"))
print(a.attr.href)
获取文本
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
a = d(".item-0.active a")
print(a.text())
"""
third item
"""
获取html
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d(".item-0.active")
print(li)
print(li.html())
"""
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<a href="link3.html"><span class="bold">third item</span></a>
"""
六、DOM操作
addClass()、removeClass()
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d(".item-0.active")
print(li)
li.removeClass("active")
print(li)
li.addClass("active")
print(li)
"""
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-0"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
"""
attr()、css()
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d(".item-0.active")
print(li)
li.attr("name", "link")
print(li)
li.css("font-size", "14px")
print(li)
"""
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-0 active" name="link"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-0 active" name="link" style="font-size: 14px"><a href="link3.html"><span class="bold">third item</span></a></li>
"""
remove()
html = """
<div class="wrap">
Hello, World.
<p>This is a paragraph.</p>
</div>
""" from pyquery import PyQuery as pq
d = pq(html)
wrap = d(".wrap")
print(wrap.text())
"""
Hello, World.
This is a paragraph.
"""
wrap.find("p").remove()
print(wrap.text()) # Hello, World.
其他DOM方法
https://pyquery.readthedocs.io/en/latest/api.html
七、伪类选择器
html = """
<div class="wrap">
<div id="container">
<ul class="list">
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-0 active"><a href="link3.html"><span class="bold">third item</span></a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
</ul>
</div>
</div>
"""
from pyquery import PyQuery as pq
d = pq(html)
li = d("li:first-child")
print(li) # <li class="item-0">first item</li>
li = d("li:last-child")
print(li) # <li class="item-0"><a href="link5.html">fifth item</a></li>
li = d("li:nth-child(2)")
print(li) # <li class="item-1"><a href="link2.html">second item</a></li>
li = d("li:gt(2)") # 从0开始计数，索引大于2
print(li)
"""
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
<li class="item-0"><a href="link5.html">fifth item</a></li>
"""
li = d("li:nth-child(2n)") # 获取偶数顺序的元素（从1开始）
print(li)
"""
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-1 active"><a href="link4.html">fourth item</a></li>
"""
li = d("li:contains(second)") # 根据文本匹配，匹配文本包含second的标签
print(li) # <li class="item-1"><a href="link2.html">second item</a></li>
更多选择器：http://www.w3school.com.cn/cssref/css_selectors.asp
爬虫之pyquery库的更多相关文章
- Python爬虫之pyquery库的基本使用
# 字符串初始化 html = ''' <div> <ul> <li class = "item-0">first item</li> ...
- python爬虫从入门到放弃（七）之 PyQuery库的使用
PyQuery库也是一个非常强大又灵活的网页解析库,如果你有前端开发经验的,都应该接触过jQuery,那么PyQuery就是你非常绝佳的选择,PyQuery 是 Python 仿照 jQuery 的严 ...
- 爬虫常用库之pyquery 库
pyquery库是jQuery的Python实现,可以用于解析HTML网页内容,我个人写过的一些抓取网页数据的脚本就是用它来解析html获取数据的.他的官方文档地址是:http://packages. ...
- Python爬虫-- PyQuery库
PyQuery库 PyQuery库也是一个非常强大又灵活的网页解析库,PyQuery 是 Python 仿照 jQuery 的严格实现.语法与 jQuery 几乎完全相同,所以不用再去费心去记一些奇怪 ...
- PYTHON 爬虫笔记六:PyQuery库基础用法
知识点一:PyQuery库详解及其基本使用 初始化 字符串初始化 html = ''' <div> <ul> <li class="item-0"&g ...
- 第四节：Web爬虫之pyquery解析库
PyQuery库也是一个非常强大又灵活的网页解析库,如果你有前端开发经验的,都应该接触过jQuery,那么PyQuery就是你非常绝佳的选择,PyQuery 是 Python 仿照 jQuery 的严 ...
- python之爬虫（九）PyQuery库的使用
PyQuery库也是一个非常强大又灵活的网页解析库,如果你有前端开发经验的,都应该接触过jQuery,那么PyQuery就是你非常绝佳的选择,PyQuery 是 Python 仿照 jQuery 的严 ...
- Python3 网络爬虫（请求库的安装）
Python3 网络爬虫(请求库的安装) 爬虫可以简单分为几步:抓取页面,分析页面和存储数据 在页面爬取的过程中我们需要模拟浏览器向服务器发送请求,所以需要用到一些python库来实现HTTP的请求操 ...
- 爬虫之PyQuery的base了解
爬虫之PyQuery的base了解 pyquery库是jQuery的Python实现,能够以jQuery的语法来操作解析 HTML 文档,易用性和解析速度都很好,和它差不多的还有BeautifulSo ...
随机推荐
- shell脚本，根据字符串获取行号的
awk中不能解析shell变量,建议做法是通过-v传递进去: 1 typeline=`cat $typepath | awk -v str="$typetmp" '/str/{pr ...
- YTU 2520: 小慧唱卡拉OK
2520: 小慧唱卡拉OK 时间限制: 1 Sec 内存限制: 128 MB 提交: 478 解决: 207 题目描述 小慧唱歌非常好听,小鑫很喜欢听小慧唱歌,小鑫最近又想听小慧唱歌了,于是小鑫请 ...
- 从Linux内核中获取真随机数
内核随机数产生器 Linux内核实现了一个随机数产生器,从理论上说这个随机数产生器产生的是真随机数.与标准C库中的rand(),srand()产生的伪随机数不同,尽管伪随机数带有一定的随机特征,但这些 ...
- Helios Service Release 2安装SVN
Eclipse Helios Service Release 2安装SVN地址:subclipse http://subclipse.tigris.org/update_1.6.x 1.使用方式:he ...
- bzoj 1029: [JSOI2007]建筑抢修【贪心+堆】
第一想法是按照结束时间贪心,但是这样有反例 所以先按照t贪心,能选则选,把选的楼的持续时间放进大根堆里,当当前的楼不能选的时候如果当前的持续时间比大根堆里最大的要小,就用这个替换最大,这样总数不变但是 ...
- JS自定义右键菜单案例
要求:点击页面鼠标右键,阻止默认右键菜单的弹出,并弹出自定义右键菜单. 效果示例: 参考代码: <!DOCTYPE html> <html lang="zh-CN" ...
- 乐搏讲自动化测试-Python语言常识及前景（3）
相信小伙伴们都知道,随着软件测试行业的发展和进步自动化测试已经成为必然.在竞争日益激烈的市场环境中也是你升职加薪的利器. 所以,小编决定从今天起!将要系统.连续.高质量的持续更新「整套自动化测试」文章 ...
- [转]深入C语言内存区域分配(进程的各个段)详解
一般情况下,一个可执行二进制程序(更确切的说,在Linux操作系统下为一个进程单元,在UC/OSII中被称为任务)在存储(没有调入到内存运行)时拥有3个部分,分别是代码段(text).数据段(data ...
- 漫谈未来的HDFS
前面我们提到的HDFS,了解了HDFS的特性和架构.HDFS能够存储TB甚至PB规模的数据是有前提的,首先数据要以大文件为主,其次NameNode的内存要足够大.对HDFS有所了解的同学肯定都知道,N ...
- LN : leetcode 231 Power of Two
lc 231 Power of Two 231 Power of Two Given an integer, write a function to determine if it is a powe ...