标签：for 获取信息 port pytho 信息 com font 实现 ext
官方学习文档：http://pyquery.readthedocs.io/en/latest/api.html
一、什么是PyQuery?
答：强大有灵活的网页解析库，模仿jQuery实现。如果你觉得正则表达式写起来太麻烦，如果你觉的BeautifulSoup语法太难记，如果你熟悉jQuery的语法，那么PyQuery就是你的绝佳选择。
二、安装
pip3 install pyquery
三、初始化
1、字符串初始化
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="blod">thrid 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
doc = pq(html)
print(doc(‘li‘))
2、URL初始化
from pyquery import PyQuery as pq doc = pq(url="http://www.baidu.com") print(doc(‘head‘))
3、文本初始化
from pyquery import PyQuery as pq doc = pq(filename = ‘demo.html‘) print(doc(‘li‘))
四、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="blod">thrid 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
doc = pq(html)
print(doc(‘#container .list li‘))
1、查找元素
子元素
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="blod">thrid 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
doc = pq(html)
items = doc(‘.list‘)
print(type(items))
print(items)
lis = items.find(‘li‘)
print(type(lis))
print(lis)
lis = items.children() print(type(lis)) print(lis)
lis = items.children(‘.active‘) print(lis)
父元素
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="blod">thrid 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
doc = pq(html)
items = doc(‘.list‘)
container = items.parent()
print(type(container))
print(container)
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="blod">thrid 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
doc = pq(html)
items = doc(‘.list‘)
container = items.parents()
print(type(container))
print(container)
parent = items.parents(‘.wrap‘) print(parents)
兄弟元素
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="blod">thrid 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
doc = pq(html)
li = doc(‘.list .item-0.active‘)
print(li.siblings())
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="blod">thrid 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
doc = pq(html)
li = doc(‘.list .item-0.active‘)
print(li.siblings(‘.active‘))
五、遍历
1、单个元素
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="blod">thrid 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
doc = pq(html)
li = doc(‘.item-0.active‘)
print(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="blod">thrid 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
doc = pq(html)
lis = doc(‘li‘).items()
print(type(lis))
for li in lis:
print(li)
2、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="blod">thrid 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
doc = pq(html)
a = doc(‘.item-0.active a‘)
print(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="blod">thrid 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
doc = pq(html)
a = doc(‘.item-0.active a‘)
print(a)
print(a.attr(‘href‘))
print(a.text())
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="blod">thrid 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
doc = pq(html)
li = doc(‘.item-0.active‘)
print(li)
print(li.html())
六、DOM操作
1、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="blod">thrid 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
doc = pq(html)
li = doc(‘.item-0.active‘)
print(li)
li.removeClass(‘active‘)
print(li)
li.addClass(‘active‘)
print(li)
2、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="blod">thrid 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
doc = pq(html)
li = doc(‘.item-0.active‘)
print(li)
li.attr(‘name‘,‘link‘)
print(li)
li.css(‘font-size‘,‘14px‘)
print(li)
3、remove
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="blod">thrid 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
doc = pq(html)
wrap = doc(‘.wrap‘)
print(wrap.text())
wrap.find(‘p‘).remove()
print(wrap.text())
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="blod">thrid 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
doc = pq(html)
li = doc("li:first-child")
print(li)
li = doc("li:last-child")
print(li)
# 标签从0开始
li = doc("li:nth-child(2)") # ntj-child（2）获取第2个标签
print(li)
li = doc("li:gt(2)") # gt-child(2)获取比2大的标签
print(li)
li = doc("li:nth-child(2n)") # nth-child(2n)获取偶数的标签
print(li)
li = doc("li:contains(second)") # contains(second)获取包含second文本的标签
print(li)
更多CSS选择器可以查看 http://www.w3school.com.cn/css/index.html
jQuery官方文档：http://jquery.cuishifeng.cn/
标签：for 获取信息 port pytho 信息 com font 实现 ext
原文地址：https://www.cnblogs.com/cthon/p/9410588.html
