python爬取指定url的ICP备案信息

#coding=gbk 
import os
import sys
import re
import time
import urllib2
   
def perror_and_exit(message, status = -1):
    sys.stderr.write(message + &＃39;\n&＃39;)
    sys.exit(status)
   
def get_text_from_html_tag(html):
    pattern_text =  re.compile(r">.*?    return pattern_text.findall(html)[0][1:-2].strip()
   
def parse_alexa(url):
    url_alexa = "http://icp.alexa.cn/index.php?q=%s" % url
    print url_alexa
    #handle exception 
    times = 0
    while times <5000: #等待有一定次数限制 
        try:
            alexa = urllib2.urlopen(url_alexa).read()
   
            pattern_table = re.compile(r".*?", re.DOTALL | re.MULTILINE)
            match_table = pattern_table.search(alexa)
            if not match_table:
                raise BaseException("No table in HTML")
            break
        except:
            print "try %s times:sleep %s seconds" % (times, 2**times)
            times += 1
            time.sleep(2**times)
            continue
   
    table = match_table.group()
    pattern_tr = re.compile(r".*?", re.DOTALL | re.MULTILINE)
    match_tr = pattern_tr.findall(table)
    if len(match_tr) != 2:
        perror_and_exit("table format is incorrect")
       
    icp_tr = match_tr[1]
    pattern_td = re.compile(r".*?", re.DOTALL | re.MULTILINE)
    match_td = pattern_td.findall(icp_tr)
       
    #print match_td 
    company_name = get_text_from_html_tag(match_td[1])
    company_properties = get_text_from_html_tag(match_td[2])
    company_icp = get_text_from_html_tag(match_td[3])
    company_icp = company_icp[company_icp.find(">") + 1:]
    company_website_name = get_text_from_html_tag(match_td[4])
    company_website_home_page = get_text_from_html_tag(match_td[5])
    company_website_home_page = company_website_home_page[company_website_home_page.rfind(">") + 1:]
    company_detail_url = get_text_from_html_tag(match_td[7])
    pattern_href = re.compile(r"href=\".*?\"", re.DOTALL | re.MULTILINE)
    match_href = pattern_href.findall(company_detail_url)
    if len(match_href) == 0:
        company_detail_url = ""
    else:
        company_detail_url = match_href[0][len("href=\""):-1]
    return [url, company_name, company_properties, company_icp, company_website_name, company_website_home_page, company_detail_url]
    pass
   
if __name__ == "__main__":
    fw = file("out.txt", "w")
    for url in sys.stdin:
        fw.write("\t".join(parse_alexa(url)) + "\n")
  
#coding=gbk
import os
import sys
import re
import time
import urllib2
  
def perror_and_exit(message, status = -1):
    sys.stderr.write(message + &＃39;\n&＃39;)
    sys.exit(status)
  
def get_text_from_html_tag(html):
    pattern_text =  re.compile(r">.*?    return pattern_text.findall(html)[0][1:-2].strip()
  
def parse_alexa(url):
    url_alexa = "http://icp.alexa.cn/index.php?q=%s" % url
    print url_alexa
    #handle exception
    times = 0
    while times <5000: #等待有一定次数限制
        try:
            alexa = urllib2.urlopen(url_alexa).read()
  
            pattern_table = re.compile(r".*?", re.DOTALL | re.MULTILINE)
            match_table = pattern_table.search(alexa)
            if not match_table:
                raise BaseException("No table in HTML")
            break
        except:
            print "try %s times:sleep %s seconds" % (times, 2**times)
            times += 1
            time.sleep(2**times)
            continue
  
    table = match_table.group()
    pattern_tr = re.compile(r".*?", re.DOTALL | re.MULTILINE)
    match_tr = pattern_tr.findall(table)
    if len(match_tr) != 2:
        perror_and_exit("table format is incorrect")
     
    icp_tr = match_tr[1]
    pattern_td = re.compile(r".*?", re.DOTALL | re.MULTILINE)
    match_td = pattern_td.findall(icp_tr)
     
    #print match_td
    company_name = get_text_from_html_tag(match_td[1])
    company_properties = get_text_from_html_tag(match_td[2])
    company_icp = get_text_from_html_tag(match_td[3])
    company_icp = company_icp[company_icp.find(">") + 1:]
    company_website_name = get_text_from_html_tag(match_td[4])
    company_website_home_page = get_text_from_html_tag(match_td[5])
    company_website_home_page = company_website_home_page[company_website_home_page.rfind(">") + 1:]
    company_detail_url = get_text_from_html_tag(match_td[7])
    pattern_href = re.compile(r"href=\".*?\"", re.DOTALL | re.MULTILINE)
    match_href = pattern_href.findall(company_detail_url)
    if len(match_href) == 0:
        company_detail_url = ""
    else:
        company_detail_url = match_href[0][len("href=\""):-1]
    return [url, company_name, company_properties, company_icp, company_website_name, company_website_home_page, company_detail_url]
    pass
  
if __name__ == "__main__":
    fw = file("out.txt", "w")
    for url in sys.stdin:
        fw.write("\t".join(parse_alexa(url)) + "\n")[python] view plaincopyprint? time.sleep(2)
    pass
  
 time.sleep(2)
    pass

每次抓取都会sleep 2s，防止ip被封，实际上即使sleep了IP过一段时间还是会被封

由于是结构化抓取，当网站格式变化此程序将无法使用