爬虫--PyQuery
什么是PyQuery？
PyQuery
初始化
字符串初始化
from pyquery import PyQuery as pq html="""
<div>
<ul>
<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">f
ourth item
</a>
</li>
<li class="item-0">
<a href="link5.html">
fifth item
</a>
</li>
</ul>
</div>
""" doc=pq(html)
print(doc("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
</a>
</li>
<li class="item-1 active">
<a href="link4.html">f
ourth item
</a>
</li>
<li class="item-0">
<a href="link5.html">
fifth item
</a>
</li>
打印后的结果为：
URL初始化
from pyquery import PyQuery as pq doc = pq(url="http://www.baidu.com")
print(doc("head"))
<head><meta http-equiv="content-type" content="text/html;charset=utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=Edge"/><meta content="always" name="referrer"/><link rel="stylesheet" type="text/css" href="http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css"/><title>ç¾åº¦ä¸ä¸ï¼ä½ å°±ç¥é</title></head>
打印后的结果为：
文件初始化
from pyquery import PyQuery as pq doc = pq(filename="demo.html")
print(doc("li"))
基本CSS选择器
from pyquery import PyQuery as pq html= """
<div id = "container">
<ul>
<li class="item-0">
first item
</li>
<li class="item-1">
<a href="link2.html">second item</a>
</li>
<li class="item-2 active">
<a href="link3.html>
<span class="bold">third item</span>
</a>
</li>
<li class="item-3 active">
<a href="link4.html">f
ourth item
</a>
</li>
<li class="item-4">
<a href="link5.html">
fifth item
</a>
</li>
</ul>
</div>
"""
doc = pq(html)
print(doc("#container .item-0"))
<li class="item-0">
first item
</li>
打印的结果为：
查找元素
子元素
from pyquery import PyQuery as pq 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-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
"""
doc = pq(html)
items = doc(".list")
print(type(items))
docs = doc.find("li")
print(type(docs))
print(docs)
<class 'pyquery.pyquery.PyQuery'>
<class 'pyquery.pyquery.PyQuery'>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
打印后的结果为：
from pyquery import PyQuery as pq 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-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
"""
doc = pq(html)
items = doc(".list")
docs = items.children() # 查找所有的直接子元素
docs1 = items.children(".active")
print(docs)
print(docs1)
<li class="item-0">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
<li class="item-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
打印后的结果为：
父元素
from pyquery import PyQuery as pq 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-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
"""
doc = pq(html)
items = doc(".list")
docs = items.parent() # 查找所有的直接父元素
print(docs)
print(type(docs))
<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-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div> <class 'pyquery.pyquery.PyQuery'>
打印后的结果：
from pyquery import PyQuery as pq 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-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".list")
docs = items.parents() # 查找所有的直接子元素
print(type(docs))
print(docs)
<class 'pyquery.pyquery.PyQuery'>
<html><body><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-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
</div></div></body></html><body><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-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
</div></div></body><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-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
</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-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
打印后的结果为：
兄弟元素
from pyquery import PyQuery as pq 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-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-0")
print(type(items.siblings()))
print(items.siblings())
<class 'pyquery.pyquery.PyQuery'>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
打印后的结果为：
from pyquery import PyQuery as pq 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-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-0active") # 同时匹配.item-0和active，若都包含item-0 + active则打印，否则不打印
item = doc(".item-0")
print(item.siblings())
print(type(items.siblings()))
print(items.siblings())
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li> <class 'pyquery.pyquery.PyQuery'>
打印后的结果为：
遍历
单个元素
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-0.active") # 同时匹配.item-0和active，若都包含item-0 + active则打印，否则不打印
print(type(items))
print(items)
<class 'pyquery.pyquery.PyQuery'>
<li class="item-0 active">first item</li>
打印后的结果为：
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc("li").items() # 遍历items ,此时的items是一个迭代器
print(type(items))
for li in items:
print(li)
<class 'generator'>
<li class="item-0 active">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class=" bold="">third item</a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
打印后的结果为：
获取信息
获取属性
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-1 a")
print(items.attr("href"))
print(items.attr.href)
link2.html
link2.html
打印后的结果为：
获取文本
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-1")
print(items.text())
second item
打印后的结果为：
获取html
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-1")
print(items)
print(items.html())
<li class="item-1"><a href="link2.html">second item</a></li> <a href="link2.html">second item</a>
打印后的结果为：
DOM操作
addClass , removeClass
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1 active"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-1")
print(items.remove_class("active"))
print(items.add_class("actives"))
<li class="item-1"><a href="link2.html">second item</a></li> <li class="item-1 actives"><a href="link2.html">second item</a></li>
打印后的结果为：
attr , css
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1 active"><a href="link2.html">second item</a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-1")
print(items.attr("name","names"))
print(items.css("font-size","14px"))
<li class="item-1 active" name="names"><a href="link2.html">second item</a></li> <li class="item-1 active" name="names" style="font: 14px"><a href="link2.html">second item</a></li>
打印后的结果为：
remove
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1 active"><a href="link2.html">second item<p>Third times</p></a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
items = doc(".item-1")
print(items.text())
print("---------------")
items.find('p').remove()
print(items.text())
second item
Third times
---------------
second item
打印后的结果为：
其他DOM方法
https://pythonhosted.org/pyquery/api.html
伪类选择器
from pyquery import PyQuery as pq html= """
<div class = "wrap">
<div id = "container">
<ul class="list">
<li class="item-0 active">first item</li>
<li class="item-1 active"><a href="link2.html">second item<p>Third times</p></a></li>
<li class="item-2 active"><a href="link3.html><span class="bold">third item</span></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
</ul>
</div>
<div>
""" doc = pq(html)
li = doc("li:first-child")
print(li)
print("------------------------------------------------------------")
li = doc("li:last-child")
print(li)
print("------------------------------------------------------------")
li = doc("li:gt(2)")
print(li)
print("------------------------------------------------------------")
li = doc("li:nth-child(2)") # 指定一个索引顺序，获取第二个li标签
print(li)
print("------------------------------------------------------------")
li = doc("li:nth-child(2n)") # 指定一个索引顺序，获取偶数的li标签
print(li)
print("------------------------------------------------------------")
li = doc("li:contains(second)") # 查找包含second的文本标签
print(li)
<li class="item-0 active">first item</li>
------------------------------------------------------------
<li class="item-4"><a href="link5.html">fifth item</a></li>
------------------------------------------------------------
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
<li class="item-4"><a href="link5.html">fifth item</a></li>
------------------------------------------------------------
<li class="item-1 active"><a href="link2.html">second item<p>Third times</p></a></li>
------------------------------------------------------------
<li class="item-1 active"><a href="link2.html">second item<p>Third times</p></a></li>
<li class="item-3 active"><a href="link4.html">fourth item</a></li>
------------------------------------------------------------
<li class="item-1 active"><a href="link2.html">second item<p>Third times</p></a></li>
打印后的结果为：
更多的CSS选择器可以查看：http://www.w3school.com.cn/css/index.asp
Pyquery的官方文档可以查看：https://pythonhosted.org/pyquery/api.html
爬虫--PyQuery的更多相关文章
- 一起学爬虫——PyQuery常用用法总结
什么是PyQuery PyQuery是一个类似于jQuery的解析网页工具,使用lxml操作xml和html文档,它的语法和jQuery很像.和XPATH,Beautiful Soup比起来,PyQu ...
- 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 ...
- 爬虫--pyquery使用
强大又灵活的网页解析库. 初始化 字符串初始化 html = ''' <div> <ul> <li class="item-0">first ...
- Python新手需要掌握的知识点
一.基础语法 1 变量 2 逻辑判断 3 循环 4 函数 二.数据结构 1 数字(加减乘除) 2 字符串(一串字符) 3 布尔 (真假) 4 元组 (不能修改的列表) 5 列表(Python的苦力,最 ...
- 一起学爬虫——使用selenium和pyquery爬取京东商品列表
layout: article title: 一起学爬虫--使用selenium和pyquery爬取京东商品列表 mathjax: true --- 今天一起学起使用selenium和pyquery爬 ...
- Python爬虫之PyQuery使用（六）
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 ...
- Python爬虫利器六之PyQuery的用法
前言 你是否觉得 XPath 的用法多少有点晦涩难记呢? 你是否觉得 BeautifulSoup 的语法多少有些悭吝难懂呢? 你是否甚至还在苦苦研究正则表达式却因为少些了一个点而抓狂呢? 你是否已经有 ...
- PYTHON 爬虫笔记十:利用selenium+PyQuery实现淘宝美食数据搜集并保存至MongeDB（实战项目三）
利用selenium+PyQuery实现淘宝美食数据搜集并保存至MongeDB 目标站点分析 淘宝页面信息很复杂的,含有各种请求参数和加密参数,如果直接请求或者分析Ajax请求的话会很繁琐.所以我们可 ...
- 小白学 Python 爬虫（23）：解析库 pyquery 入门
人生苦短,我用 Python 前文传送门: 小白学 Python 爬虫(1):开篇 小白学 Python 爬虫(2):前置准备(一)基本类库的安装 小白学 Python 爬虫(3):前置准备(二)Li ...
随机推荐
- Geek荣耀大会总结
0.0 首先没有被抽中, 其次可乐真难喝,再次我没有去拍无人机合影,再再次还是很受打击的. 1.0 其实 对geek 和1024大会无感,主要原因 没有三倍加班费的节日在我眼里都不是节日. 上面只是简 ...
- Spring事务管理Transaction【转】
Spring提供了许多内置事务管理器实现(原文链接:https://www.cnblogs.com/qiqiweige/p/5000086.html): DataSourceTransactionMa ...
- Centos 7 环境下，如何使用 Apache 实现 SSL 虚拟主机 双向认证 的详细教程：
1. testing ! ... 1 1 原文参考链接: http://showerlee.blog.51cto.com/2047005/1266712 很久没有更新LAMP的相关文档了,刚好最近单位 ...
- Linux服务器ping不通域名出现的unknown host 错误解决办法
"ping: unknown host www.baidu.com" 解决方法 如果某台Linux服务器ping不通域名, 如下提示: # ping www.baidu.compi ...
- UVA12583_Memory Overow
题目是很简单的队列维护的题目. 每次加入之前判断该字母是否在队列以及队列的容量是否超过k即可. #include <iostream> #include <cstdio> #i ...
- BZOJ 1226 学校食堂(状压DP)
状压DP f(i,j,k)表示前i−1个人已经吃了饭,且在i之后的状态为j的人也吃了饭(用二进制表示后面的状态),最后吃的那个人是i之后的第k个 (注意k可以是负数) 然后 如果j&1=1那么 ...
- 【Mybatis】Mybatis的sql模糊查询
这个网站中有很多方法.https://code.google.com/p/mybatis/issues/detail?id=85 自己试验了如下的方法. 1. 参数中直接加入%% param.set ...
- 3.7 TCP拥塞控制
3.7 TCP拥塞控制 在3.5.5流量控制中有,接收方通过维护一个rwnd来控制流量,本节中考虑三个问题: 第一, 一个TCP发送方如何限制它向其他连接发送流量的速率. 第二, 一个TCP发送方 ...
- BZOJ3527：[ZJOI2014]力——题解
http://www.lydsy.com/JudgeOnline/problem.php?id=3527 给出n个数qi,给出Fj的定义如下: 令Ei=Fi/qi,求Ei. 参考:https://ww ...
- Codeforces 671C. Ultimate Weirdness of an Array（数论+线段树）
看见$a_i\leq 200000$和gcd,就大概知道是要枚举gcd也就是答案了... 因为答案是max,可以发现我们很容易算出<=i的答案,但是很难求出单个i的答案,所以我们可以运用差分的思 ...