一 遍历单个域名
import random from urllib.request import urlopen import re import datetime from bs4 import BeautifulSoup random.seed(datetime.datetime.now()) def getLinks(articleurl): html = urlopen("https://en.wikipedia.org"+articleurl) bsobj = BeautifulSoup(html) 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)
二 采集整个网络
from urllib.request import urlopen from bs4 import BeautifulSoup import re pages = set() def getLinks(pageUrl): global pages html = urlopen("https://en.wikipedia.org" + pageUrl) bsobj = BeautifulSoup(html) for link in bsobj.findAll("a",href=re.compile("^(/wiki/)")): if 'href' in link.attrs: if link.attrs['href'] not in pages: #遇到新的页面 newPage = link.attrs['href'] print(newPage) pages.add(newPage) getLinks(newPage) getLinks("")
三 收集整个网站的数据
from urllib.request import urlopen from bs4 import BeautifulSoup import re pages = set() def getLinks(pageUrl): global pages html = urlopen("https://en.wikipedia.org" + pageUrl) bsobj = BeautifulSoup(html) try: print(bsobj.h1.get_text()) print(bsobj.find(id="mw-content-text").findAll("p")[0]) # print(bsobj.find(id="ca-edit").find("span").find("a").attrs['href']) except AttributeError as e: print(e) print("页面少了一些属性,不用担心") for link in bsobj.findAll("a",href=re.compile("^(/wiki/)")): if 'href' in link.attrs: if link.attrs['href'] not in pages: newPage = link.attrs['href'] print(" ") print(newPage) pages.add(newPage) getLinks(newPage) getLinks("")
四 解析JSON数据
import json from urllib.request import urlopen def getCountry(ipAddress): response = urlopen("http://freegeoip.net/json/"+ipAddress).read() .decode('utf-8') responseJson = json.loads(response) return responseJson["country_code"] print(getCountry("50.78.253.58"))
五 根据文件的url下载文件
from urllib.request import urlretrieve from urllib.request import urlopen from bs4 import BeautifulSoup html = urlopen("http://www.pythonscraping.com") bsObj = BeautifulSoup(html) imageLocation = bsObj.find("a", {"id": "logo"}).find("img")["src"] urlretrieve (imageLocation, "logo.jpg")