1.查找以<a>开头的所有文本,然后判断href是否在<a>里面,如果<a>里面有href,就像<a href=" " >,然后提取href的值。
from urllib.request import urlopen from bs4 import BeautifulSoup html = urlopen("http://en.wikipedia.org/wiki/Kevin_Bacon") bsObj = BeautifulSoup(html) for link in bsObj.findAll("a"): if ‘href‘ in link.attrs: print(link.attrs[‘href‘])
运行结果:
在网页源代码的定位:
2.提取以 /wiki/开头的文本
from urllib.request import urlopen from bs4 import BeautifulSoup import re html = urlopen("http://en.wikipedia.org/wiki/Kevin_Bacon") bsObj = BeautifulSoup(html,"lxml") for link in bsObj.find("div", {"id":"bodyContent"}).findAll("a",href=re.compile("^(/wiki/)((?!:).)*$")): if ‘href‘ in link.attrs: print(link.attrs[‘href‘])
运行结果:
3.连环着提取不同网页以/wiki开头的文本
from urllib.request import urlopen from bs4 import BeautifulSoup import datetime import random import re random.seed(datetime.datetime.now()) def getLinks(articleUrl): html = urlopen("http://en.wikipedia.org"+articleUrl) bsObj = BeautifulSoup(html,"lxml") return bsObj.find("div", {"id":"bodyContent"}).findAll("a",href=re.compile("^(/wiki/)((?!:).)*$")) links = getLinks("/wiki/Kevin_Bacon") while len(links) > 0: newArticle = links[random.randint(0, len(links)-1)].attrs["href"] print(newArticle) links = getLinks(newArticle)
运行结果:
运行一段时间之后,会报错:远程主机强迫关闭了一个现有的连接,这是网站拒绝程序的连接吗?
时间: 2024-10-06 13:33:15