python实现百度关键词排名查询

就是一个简单的python查询百度关键词排名的函数，以下是一些简介：
1、UA随机
2、操作简单方便，直接getRank(关键词，域名)就可以了
3、编码转化。编码方面应该没啥问题了。
4、结果丰富。不仅有排名，还有搜索结果的title，URL，快照时间，符合SEO需求
5、拿来做个软件或者自己用都很方便。

功能是单线程实现，速度慢，大家可以参考修改成自己需要的。

#coding=utf-8

import requests
import BeautifulSoup
import re
import random
def decodeAnyWord(w):
 try:
 w.decode('utf-8')
 except:
 w = w.decode('gb2312')
 else:
 w = w.decode('utf-8')
 return w
def createURL(checkWord): #create baidu URL with search words
 checkWord = checkWord.strip()
 checkWord = checkWord.replace(' ', '+').replace('\n', '')
 baiduURL = 'http://www.baidu.com/s?wd=%s&rn=100' % checkWord
 return baiduURL
def getContent(baiduURL): #get the content of the serp
 uaList = ['Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.1;+SV1;+.NET+CLR+1.1.4322;+TencentTraveler)',
 'Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.1;+SV1;+.NET+CLR+2.0.50727;+.NET+CLR+3.0.4506.2152;+.NET+CLR+3.5.30729)',
 'Mozilla/5.0+(Windows+NT+5.1)+AppleWebKit/537.1+(KHTML,+like+Gecko)+Chrome/21.0.1180.89+Safari/537.1',
 'Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.1;+SV1)',
 'Mozilla/5.0+(Windows+NT+6.1;+rv:11.0)+Gecko/20100101+Firefox/11.0',
 'Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+5.1;+Trident/4.0;+SV1)',
 'Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+5.1;+Trident/4.0;+GTB7.1;+.NET+CLR+2.0.50727)',
 'Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+5.1;+Trident/4.0;+KB974489)']
 headers = {'User-Agent': random.choice(uaList)}
 r = requests.get(baiduURL, headers = headers)
 return r.content
def getLastURL(rawurl): #get final URL while there're redirects
 r = requests.get(rawurl)
 return r.url
def getAtext(atext): #get the text with <a> and </a>
 pat = re.compile(r'<a .*?>(.*?)</a>')
 match = pat.findall(atext.replace('\n', ''))
 pureText = match[0].replace('<em>', '').replace('</em>', '')
 return pureText.replace('\n', '')
def getCacheDate(t): #get the date of cache
 pat = re.compile(r'<span class="g">.*?(\d{4}-\d{1,2}-\d{1,2})</span>')
 match = pat.findall(t)
 cacheDate = match[0]
 return cacheDate
def getRank(checkWord, domain): #main line
 checkWord = checkWord.replace('\n', '')
 checkWord = decodeAnyWord(checkWord)
 baiduURL = createURL(checkWord)
 cont = getContent(baiduURL)
 soup = BeautifulSoup.BeautifulSoup(cont)
 results = soup.findAll('table', {'class': 'result'}) #find all results in this page
 for result in results:
 checkData = unicode(result.find('span', {'class': 'g'}))
 if re.compile(r'^[^/]*%s.*?' %domain).match(checkData.replace('<b>', '').replace('</b>', '')): #改正则
 nowRank = result['id'] #get the rank if match the domain info
 resLink = result.find('h3').a
 resURL = resLink['href']
 domainURL = getLastURL(resURL) #get the target URL
 resTitle = getAtext(unicode(resLink)) #get the title of the target page
 rescache = result.find('span', {'class': 'g'})
 cacheDate = getCacheDate(unicode(rescache)) #get the cache date of the target page
 res = u'%s, 第%s名, %s, %s, %s' % (checkWord, nowRank, resTitle, cacheDate, domainURL)
 return res.encode('gb2312')
 break
 else:
 return '>100'

domain = 'www.baidu.com' #set the domain which you want to search.
print getRank('百度', domain)

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