標籤：字串 官網 nbsp class pre one ges color cond
PyQuery庫也是一個非常強大又靈活的網頁解析庫，如果你有前端開發經驗的，都應該接觸過jQuery,那麼PyQuery就是你非常絕佳的選擇，PyQuery 是 Python 仿照 jQuery 的嚴格實現。文法與 jQuery 幾乎完全相同，所以不用再去費心去記一些奇怪的方法了。
官網地址：http://pyquery.readthedocs.io/en/latest/
jQuery參考文檔： http://jquery.cuishifeng.cn/
1、字串的初始化
from pyquery import PyQuery as pqhtml = ‘‘‘<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">fourth item</a></li> <li class="item-0"><a href="link5.html">fifth item</a></li> </ul></div>‘‘‘doc = pq(html)print(doc)print(type(doc))print(doc(‘li‘))
<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">fourth item</a></li> <li class="item-0"><a href="link5.html">fifth item</a></li> </ul></div><class ‘pyquery.pyquery.PyQuery‘><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>運行結果
2、開啟html檔案
注意路勁問題
from pyquery import PyQuery as pqdoc = pq(filename=‘index.html‘)print(doc)print(doc(‘head‘))
<title>Title</title></head><body> <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">fourth item</a></li> <li class="item-0"><a href="link5.html">fifth item</a></li> </ul></div>‘‘‘</body></html><head> <meta charset="UTF-8"/> <title>Title</title></head>運行結果
3、開啟某個網站
doc = pq(‘https://www.baidu.com‘)# doc1 = pq(url=‘https://www.baidu.com‘)print(doc)print(doc(‘head‘))
4、基於CSS選取器尋找
from pyquery import PyQuery as pqhtml = ‘‘‘<div> <ul id = ‘haha‘> <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>‘‘‘doc = pq(html)print(doc)#id等於haha下面的class等於item-0下的a標籤下的span標籤（注意層級關係以空格隔開）print(doc(‘#haha .item-0 a span‘))
<div> <ul id="haha"> <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><span class="bold">third item</span>運行結果
python爬蟲之PyQuery的基本使用
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